Abstract: A document management device (100) comprises a document information storage unit (114) for storing document information including at least one keyword associated with a document so as to search for the document, a sectoral keyword list storage unit (122) for storing a sectoral keyword option list containing a technical keyword relating to each of sections, a common keyword list storage unit (120) for storing a common keyword option list containing a general keyword common to the sections, an authenticating unit (108) for authenticating the login by the user into a section, a presenting unit (128) for displaying the sectoral keyword option list of the section and the common keyword option list on a screen, a keyword receiving unit (130) for receiving the in keyword selected from the sectoral or common keyword option list, a searching unit (132) for searching the document information storage unit (114) by using the received keyword, and a presenting unit (128) for presenting the search result to the user.

Abstract: In a process of hydrocracking heavy oil with a catalyst in petroleum refining, asphaltene contained in heavy oil, and impurities including heavy metals such as nickel and vanadium, are efficiently removed with activated carbon, whereby the reduction in catalyst activity or formation of coke by the impurities can be prevented. The invention provides a hydrocracking catalyst comprising activated carbon extrudate as a carrier activated with steam and having a high distribution of pores having pore sizes in the range of 20 to 200 nm.

Abstract: A method for treating a formaldehyde-containing waste liquid, which is formed as a byproduct in a plant for the production of hydrocarbons or oxygen-containing compounds, containing the steps of: subjecting formaldehyde in the liquid to chemical treatment; and treating the resulting waste liquid, while being aerated, by using a membrane bioreactor that is composed of a microorganism or enzyme and a separation membrane.

Abstract: A method of treating organic matter-containing waste liquid, which is formed as a byproduct in a plant for the production of oxygen-containing compounds or liquid hydrocarbons (including liquid fuel oil and chemicals, which are produced from natural gas through a synthetic gas), having the step of: treating the waste liquid at a high temperature of 40° C. or higher, while being aerated, by using a membrane bioreactor (2) that is equipped with a separation membrane (7b).

Abstract: In a granulating process for preparing granular urea from an aqueous urea solution using a fluidized bed method or a fluidized, spouted bed method, an aqueous urea solution having a urea concentration of 94-98.5 wt % is used and the operational temperature of the fluidized bed is controlled in a range of 110-120° C. to accelerate the drying of a granulated product to thereby give a granular urea product having a moisture content of 0.3 wt % or less.

Abstract: It is intended to enable an apparatus for synthesizing urea and a method for revamping the same to place a heavy condenser at a relatively low position and to circumvent problems associated with letting a process fluid flow within a tube in the condenser. The present invention provides an apparatus for synthesizing urea including: a synthesis reactor for reacting NH3 with CO2 to obtain a urea synthesis solution containing urea, unreacted NH3 and CO2, and water; a stripper for stripping the urea synthesis solution with use of at least a part of raw material CO2 to separate a gas containing the unreacted NH3 and CO2; a vertical submerged condenser having a shell and tube structure for condensing the gas in an absorbing medium on the shell side while cooling the gas with a cooling medium passing through the tube side; and recycling means for recycling a liquid obtained from this condenser to the synthesis reactor, wherein this condenser is placed below the synthesis reactor.

Abstract: It is intended to enable more smooth operation in an apparatus for synthesizing urea by circumventing the downward flow of a urea synthesis solution which is a gas-liquid two-phase flow and stabilizing the flow of the urea synthesis solution still remaining the gas-liquid two-phase flow and to reduce energy loss by giving smaller flow resistance.

Abstract: A device to reform a raw material gas into a synthesis gas rich in hydrogen and carbon monoxide is disclosed. The device includes a vessel, a floating head, a plurality of reaction tubes, inlets and outlets for raw material and heating gases, and a cooled fixed tube plate.

Abstract: In a process and an apparatus for synthesizing urea which synthesize urea from ammonia and carbon dioxide, the operating condition can be grasped easily and with good accuracy. A process for synthesizing urea which includes: a reaction step of obtaining a urea synthesis solution which contains urea, unreacted ammonia, unreacted carbon dioxide and water by causing ammonia and carbon dioxide to react with each other; a stripping step of separating a gas mixture containing the unreacted ammonia and the unreacted carbon dioxide by stripping the urea synthesis solution by using at least a portion of raw material carbon dioxide; a condensing step of obtaining a condensed liquid by condensing the gas mixture in an absorbing medium while cooling the gas mixture; a recycling step of recycling the condensed liquid to the reaction step; and a step of measuring the density of the condensed liquid online. An apparatus for carrying out this process is provided.

Abstract: A reactor including a reactor vessel and heat exchange tubes provided in the reactor vessel. The reactor vessel includes a tubesheet and is configured to receive a reaction fluid. The tubesheet has a first plate member configured to contact the reaction fluid and a second plate member configured to not contact the reaction fluid. Heat exchange tubes are provided in the reactor vessel and fixed to the first plate member. The heat exchange tubes are configured to receive a heat exchange medium. At least a portion of the first plate member configured to contact the reaction fluid is made of a metal that has a high corrosion-resistance against the reaction liquid, and the second plate member is made of a metal that has a low corrosion-resistance against the reaction liquid. The second plate member is detachably fixed to a remainder of the reactor vessel.

Abstract: An information management apparatus of the present invention including a database DB1, in which document information and keywords which have been correlated to the document information in order to search for the document information are electronically saved, a copy unit that copies the document information and the keywords from the DB1 at the same time, a keyword temporary storage unit that stores the copied document information and keywords, a keyword acceptance unit that accepts entry of the keyword selected from a list of keyword options displayed on a keyword entry screen as a keyword to be correlated to the copied document information, a notification unit that prompts entry of the keyword from the keyword option list displayed on the keyword entry screen when the document information is copied, and a registration unit that stores the keywords in the storage unit into a database DB2 in a condition where they are correlated to the document information in the storage unit, wherein the keywords in the storag

Abstract: There are provided a process for separation of hydrocarbons including the steps of: (a) a feed gas is cooled and partly condensed, and separated into a gas and a liquid; (b) the liquid obtained in step (a) is supplied to a distillation column; (c) the gas obtained in step (a) is expanded by an expander and partly condensed, and separated into a gas and a liquid; (d) the liquid obtained in step (c) is supplied to the distillation column; (e) the gas obtained in step (c) is divided into a first portion and a second portion; (f) the first portion is supplied to the distillation column; (g) the second portion is condensed by being compressed and cooled, and then depressurized and supplied as a reflux to the distillation column; and (h) a residue gas is obtained from the top part of the distillation column and a heavier fraction is obtained from the bottom part of the distillation column; and an apparatus therefor. The process and apparatus enable efficient separation of hydrocarbons.

Abstract: A duplex stainless steel for use in urea manufacturing plants, in mass %, consisting of C: 0.03% or less, Si: 0.5% or less, Mn: 2% or less, P: 0.04% or less, S: 0.003% or less, Cr: 26% or more, but less than 28%, Ni: 6-10%, Mo: 0.2-1.7%, W: more than 2%, but no more than 3%, N: more than 0.3%, but no more than 0.4%, with the balance being Fe and impurities, in which the content of Cu as an impurity is not more than 0.3%. The duplex stainless steel may also have Ca, Ce, and B content, and it is desirable that levels of Al and O (oxygen) as an impurities be no more than 0.05% and 0.01% respectively. Further, it is preferable that an increase in the Vickers hardness of the steel should not be more than 80, before and after the solution treated steel is subjected to the heat treatment of 800° C. for 30 minutes and subsequent water cooling. This duplex stainless steel possesses a high corrosion resistance.

Abstract: The present invention provides a granulation method with increased drying effect while assuring the pressure for spraying the aqueous solution and the necessary number of nozzles equivalent to those of conventional design. Specifically, the granulation method uses a granulator structured by a fluid bed which fluidizes the granulating-particles, an air feed pipe to introduce air, a nozzle for spraying the raw material aqueous solution being located at center part of the air feed pipe, and a perforated plate to feed a fluidization air to the fluid bed, thus granulating the raw material aqueous solution by spraying thereof from the nozzle into a granulation part, wherein a multi-nozzle in a specified shape having a plurality of nozzle ends thereon is used as the nozzle for spraying the raw material aqueous solution.

Abstract: An apparatus and process for separating a feed liquefied natural gas containing at least methane and a hydrocarbon less volatile the methane, into a product natural gas enriched with methane and lean in hydrocarbon less volatile than methane and a heavier fraction lean in methane and enriched with hydrocarbon less volatile than methane. The process includes heating the feed liquefied natural gas in a heat exchanger, passing the heated fluid into a distillation column, withdrawing the heavier fraction from a bottom of the column, and withdrawing a residue gas from a top of the column. The process also includes liquefying at least part of the residue gas in the heat exchanger, refluxing a part of the liquid portion of the fluid obtained in the liquefying step into the column, and withdrawing, as the product natural gas, the remainder of the liquid portion.

Abstract: An apparatus and process for separating a feed liquefied natural gas containing at least methane and a hydrocarbon less volatile the methane, into a product natural gas enriched with methane and lean in hydrocarbon less volatile than methane and a heavier fraction lean in methane and enriched with hydrocarbon less volatile than methane. The process includes heating the feed liquefied natural gas in a heat exchanger, passing the heated fluid into a distillation column, withdrawing the heavier fraction from a bottom of the column, and withdrawing a residue gas from a top of the column. The process also includes liquefying at least part of the residue gas in the heat exchanger, refluxing a part of the liquid portion of the fluid obtained in the liquefying step into the column, and withdrawing, as the product narutal gas, the remainder of the liquid portion.

Abstract: A reformer for reacting a raw material gas to be reformed, with an oxidizing agent gas and a reforming agent gas in the presence of an oxidation catalyst and a reforming catalyst to obtain a hydrogen-containing gas, including: a set of catalyst layers consisting of an oxidation catalyst layer and a reforming catalyst layer, and two or more inlets for feeding the oxidizing agent gas to the oxidation catalyst and/or the reforming catalyst in plural stages. The reformer can produce a hydrogen-containing gas without forming a combustion region of a temperature of as high as one thousand and several hundreds centigrade and can be manufactured at a low cost.

Abstract: A fuel reforming method includes the step of supplying carbon-containing fuel and steam to a reactor filled with a fuel reforming catalyst and a CO2 absorbent and discharging CO2, and setting the absorbent at an absorption temperature, thereby converting the carbon-containing fuel into reformed fuel, and separating CO2 from the reformed fuel, the step of obtaining a product gas by oxidizing a portion of the reformed fuel and/or the carbon-containing fuel with an oxidizer, and heating the absorbent with this product gas to a regeneration temperature, thereby regenerating the absorbent and storing heat in this absorbent, and the step of supplying the carbon-containing fuel and steam to the reactor, thereby cooling, to the absorption temperature, the absorbent heated to the regeneration temperature, and converting the carbon-containing fuel into reformed fuel by heat energy stored in the CO2 absorbent. An apparatus for the method is also disclosed.

Abstract: A process for producing dimethyl ether, which includes dehydrating methanol in vapor phase in the presence of an activated alumina catalyst having an average pore radius of 2.5 nm to 8.0 nm both inclusive and having a sodium oxide content of 0.07 wt % or less. This invention provides a process for producing DME with an improved conversion ratio using a highly active DME-production catalyst.

Abstract: A method for determining a urea concentration in an aqueous solution containing urea, includes: hydrolyzing the urea in the aqueous solution, measuring an electric conductivity ? of the aqueous solution, and determining the urea concentration in the aqueous solution from the electric conductivity ? using a correlation between the urea concentration and an electric conductivity.