Abstract: A new process is described for the preparation of free flowing hydrated amorphous silica from kimberlite tailing—a waste in diamond mining. The process comprises treating of kimberlite with acid, further reacting it with alkali solution to obtain soluble metal silicate solution, which is subsequently neutralized with mineral acid to polymerize silica as insoluble precipitates. The products is useful in rubber, paints as abrasive etc.

Abstract: A dispenser for dispensing a polymerization catalyst solution into a liquid coating formulation has a cross sectional area “a” given by the relationship: a?P·A·[W/w]·10?6, where “A” is the cross sectional area of the reservoir holding a liquid coating formulation having “W” weight percent of solids; “w” is the weight percent of catalyst in the dispenser; and P is the ratio by weight of the catalyst to the solids desired in the finished coating, in parts per million.

Abstract: This invention concerns a process for recovering and purifying dianhydro sugar alcohols from a vapor stream comprising dianhydro sugar alcohols, such as isosorbide, and water vapor.

Abstract: An integrated continuous process is disclosed for the manufacture of high purity, polymer grade dianhydro sugar alcohols, such as isosorbide, by the dehydration of corresponding sugar alcohols. The water vapors evolved during the dehydration are used to separate product dianhydro sugar alcohols from the high boiling byproducts in the reaction mass. The product is recovered from the vapor stream as high purity crystals. The high boiling reaction byproducts are recycled.

Abstract: A process for recycling reaction byproducts in the manufacture of dianhydro sugar alcohols, such as isosorbide, from corresponding sugar alcohols.

Abstract: A continuous process for the manufacture of dianhydro sugar alcohols by dehydration of the corresponding sugar alcohols or monoanhydro sugar alcohols in the presence of a dehydration catalyst, using evolved water vapor as a carrier for continuous separation of the product from the reaction mass.

Abstract: The present invention provides a process for the preparation of diphenic acid from phenanthrene which comprises heating phenanthrene and glacial acetic acid, adding drop-wise a pre-determined amount of 30% hydrogen peroxide, heating the resulting mixture after completion of drop wise addition of hydrogen peroxide, distilling the resulting mixture under reduced pressure to make the volume half, cooling the mixture till diphenic acid crystalises out, filtering the cooled mixture and boiling the residue after adding 10% solution of sodium carbonate and activated charcoal, filtering and discarding the residue; acidifying the filtrate with hydrogen chloride; cooling the resultant mixture till more diphenic acid crystallises out; repeating filtration till pure diphenic acid is obtained.

Abstract: An integrated continuous process is disclosed for the manufacture of high purity, polymer grade dianhydro sugar alcohols, such as isosorbide, by the dehydration of corresponding sugar alcohols. The water vapors evolved during the dehydration are used to separate product dianhydro sugar alcohols from the high boiling byproducts in the reaction mass. The product is recovered from the vapor stream as high purity crystals. The high boiling reaction byproducts are recycled.

Abstract: The present invention discloses a relaxor material lead iron tungstate which has been synthesized in doped and undoped conditions by single and two step heat treatment. The relaxor material is seen to exhibit almost negligible hysteresis and a transducer made thereby shows pressure measurement capability over a wide range from 0.5 MPa to 415 MPa with accuracy of ±0.05%.

Abstract: This invention concerns a process for recovering and purifying dianhydro sugar alcohols from a vapor stream comprising dianhydro sugar alcohols, such as isosorbide, and water vapor.

Abstract: A continuous process for the manufacture of dianhydro sugar alcohols by dehydration of the corresponding sugar alcohols or monoanhydro sugar alcohols in the presence of a dehydration catalyst, using evolved water vapor as a carrier for continuous separation of the product from the reaction mass.

Abstract: This invention concerns a process for the manufacture of anhydro- and dianhydro- hexitols, pentitols, and tetritols by the dehydration of sugar alcohols (alditols) in the presence of a dehydration catalyst and with the assistance of an inert gas sparge.

Abstract: A process for recycling reaction byproducts in the manufacture of dianhydro sugar alcohols, such as isosorbide, from corresponding sugar alcohols.

Abstract: The present invention discloses a relaxor material lead iron tungstate which has been synthesized in doped and undoped conditions by single and two step heat treatment. The relaxor material is seen to exhibit almost negligible hysteresis and a transducer made thereby shows pressure measurement capability over a wide range from 0.5 MPa to 415 MPa with accuracy of ±0.05%.

Abstract: The present invention discloses a relaxor material lead iron tungstate which has been synthesized in doped and undoped conditions by single and two step heat treatment. The relaxor material is seen to exhibit almost negligible hysteresis and a transducer made thereby shows pressure measurement capability over a wide range from 0.5 MPa to 415 MPa with accuracy of ±0.05%.

Abstract: This invention concerns a process for the manufacture of anhydro- and dianhydro-hexitols, pentitols, and tetritols by the dehydration of sugar alcohols (alditols) in the presence of a dehydration catalyst.

Abstract: This invention concerns a process for the manufacture of anhydro- and dianhydro- hexitols, pentitols, and tetritols by the dehydration of sugar alcohols (alditols) in the presence of a dehydration catalyst and with the assistance of an inert gas sparge.

Abstract: This invention concerns a process for the manufacture of anhydro- and dianhydro-hexitols, pentitols, and tetritols by the dehydration of sugar alcohols (alditols) in the presence of a dehydration catalyst.

Abstract: An improved process and apparatus for the production of a polyester or other condensation polymer is disclosed. In particular, polymerization is conducted in a reaction vessel equipped with a specially designed agitator that exposes the polymer melt partially filling the reaction vessel to inert gas flowing through the vessel. The agitator comprises a plurality of elements that lift a portion of a polymer melt in the reaction vessel and generate films of the polymer melt which films extends in planes that are parallel to the axis of the agitator and the flow of gas through the reaction vessel. In a preferred process, a melt of bis(2-hydroxyethyl) terephthalate, or its low molecular oligomers, obtained by esterifying terephthalic acid or transesterifying dimethyl terephthalate with ethylene glycol, is contacted with an inert gas at about atmospheric pressure in order to remove the reaction by-products and facilitate polymerization.

Abstract: An atmospheric pressure process for the continuous production of polyester is disclosed wherein a melt of bis(3-hydroxy propyl) terephthalate, or its low molecular oligomers, obtained by esterifying terephthalic acid or transesterifying dimethyl terephthalate with propylene glycol, is intimately contacted with an inert gas to facilitate polymerization and removal of the reaction by-products. The propylene glycol evolved and the inert gas are recycled.