Abstract: A method for producing methyl tert-butyl ether which comprises the steps of: allowing isobutylene-containing hydrocarbon and methyl alcohol in a given molar ratio to react at a given temperature, pressure and liquid space velocity in the presence of strongly acidic cation-exchange resin catalyst; then passing the reaction product through a fixed bed filled with a water-insoluble, solid particulate acid-neutralizing agent; and subjecting the effluent to flashing operation, preferably also to rectification, to obtain methyl tert-butyl ether. Further included in the invention is the preparation of a fuel composition by mixing the thus obtained methyl tert-butyl ether into an internal combustion fuel.

Abstract: A process for fermentatively producing vitamin B.sub.12, which comprises cultivating a vitamin B.sub.12 -producing microorganism belonging to at least one of the genus Arthrobacter and the genus Propionibacterium in the presence of a pre-cultivation product of a vitamin B.sub.12 -producing microorganism belonging to at least the other genus, and separating vitamin B.sub.12 from the culture broth.

Abstract: This invention provides an oil soluble fungicide comprising a compound having the general formula ##STR1## wherein R.sub.1 is a mononuclear aromatic hydrocarbon radical comprising up to 22 carbon atoms, R.sub.2 and R.sub.3, which may be the same or different, each represents an aliphatic hydrocarbon radicals comprising up to 8 carbon atoms, R.sub.4 is an aliphatic hydrocarbon radical comprising from 8 to 20 carbon atoms; R.sub.5 is an alkylbenzene radical in which the alkyl group contains from 10 to 14 carbon atoms; and X.sup..crclbar. is a sulfonate radical.

Abstract: A method for producing methyl tert-butyl ether which comprises the steps of: allowing isobutylene-containing hydrocarbon and methyl alcohol in a given molar ratio to react at a given temperature, pressure and liquid space velocity in the presence of strongly acidic cation-exchange resin catalyst; then passing the reaction product through a fixed bed filled with a water-insoluble, solid particulate acid-neutralizing agent; and subjecting the effluent to flashing operation, preferably also to rectification, to obtain methyl tert-butyl ether. Further included in the invention is the preparation of a fuel composition by mixing the thus obtained methyl tert-butyl ether into an internal combustion fuel.

Abstract: In a method of removing nitrogen oxides non-catalytically from an exhaust combustion gas by maintaining said combustion gas at a temperature of from 700.degree. to 1300.degree. C in the presence of oxygen and an ammonia source in a combustion apparatus which has heat exchange surfaces in a zone downstream of the position where the ammonia source is added, the improvement which comprises feeding said ammonia source to the exhaust combustion gas at a position where the heat exchange surface area in the space downstream of the position of ammonia source addition which has a combustion gas residence time of up to 1 second is less than 0.5 .times. 10.sup.-2 m.sup.2 per 1 Nm.sup.3 /H of said combustion gas flow; and the temperature of said combustion gas at the outlet of said space is above 700.degree. C.

Abstract: A process for producing vitamin B.sub.12, which comprises cultivating a vitamin B.sub.12 -producing micro-organism of the genus Arthrobacter under aerobic conditions in a culture medium containing at least one compound selected from the group consisting of alcohols with 2 or 3 carbon atoms and ketones, and separating vitamin B.sub.12 from the culture broth.

Abstract: A cock apparatus of automatic ignition type for use in a gas appliance including an ignition handle, a valve member disposed within the cock body for rotation with the turning movement of the ignition handle thereby supplying gas to a main burner and a pilot burner, and a spark generator generating sparks for igniting the pilot burner in response to the turning movement of the ignition handle. The cock comprises a rotary shaft capable of free rotation and restrained rotation relative to the valve member and normally urged by a spring to rotate in the closing direction of the valve member, and a heat sensor for sensing ignition and non-ignition of the main burner, the heat sensor being operatively connected to the rotary shaft so that the rotary shaft and the valve member can be automatically rotated in the valve closing direction by the force of the spring in the event of ignition failure of gas or accidental extinction of gas flame burning on the main burner.

Abstract: A process for producing glucose isomerase which comprises cultivating a glucose isomerase-producing bacterium belonging to the genus Corynebacterium under aerobic conditions in a culture medium containing carbon sources and nitrogen sources and separating the glucose isomerase-containing cells from the culture broth, and a process for producing fructose which comprises contacting glucose in an aqueous medium with the glucose isomerase-containing cells of a bacterium belonging to the genus Corynebacterium or glucose isomerase separated therefrom.