Mitsubishi Gas Chemical Company, Inc.

Sharp Kabushiki Kaisha Corporation

Fumio Tanaka

Takuji Shitara

Takafumi Abe

Shuji Ebata

Kenichi Nakamura

Yutaka Takafuji

Kazuyoshi Fujioka

Takako Uchiyama

Masaki Takemoto

Kazuhiko Amakawa

Kojiro Tsubota

Hiroyuki Nitobe

Tsuyoshi Kurokawa

Tsumoru Morimoto

A method of recovering ammonia by the distillation of an aqueous solution containing ammonia, carbon dioxide and hydrogen cyanide. The distillation is conducted using a distillation apparatus having at least its portion which comes into contact with the aqueous solution made of an alloy 1 or alloy 2. The alloy 1 contains 3% by weight or more of molybdenum, 15% by weight or more of nickel and 15% by weight or more of chromium. The alloy 2 contains 1% by weight or more of molybdenum, 9% by weight or less of nickel and 20% by weight or more of chromium. The use of the alloy 1 or alloy 2 prevents the corrosion of the distillation apparatus and enables the stable recovery of ammonia for a long period of time.

Method of recovering ammonia

In a process for producing a nitrile compound comprising introducing a carbon ring or heterocyclic compound having organic substituents, ammonia and the air into a reactor and reacting the introduced compounds in the presence of a catalyst, during the reaction, a residual gas obtained after the formed nitrile compound is separated from a reaction gas discharged from the reactor is recycled to the reactor in an amount of 10 to 60% by volume based on the amount of the fresh raw material gas supplied to the reactor and the ratio of the amount by mole of molecular oxygen to the amount by mole of the organic substituent in the carbon ring or heterocyclic compound having organic substituents supplied to the reactor (O/organic substituent) is kept within 1.5 to 7. The reaction is achieved under an advantageous condition and the nitrile compound can be produced industrially advantageously at a higher yield.

Process for producing a nitrile compound

In a process for producing a polynitrile compound comprising introducing a polysubstituted organic compound (POC) which is a carbon ring or heterocyclic compounds having a plurality of organic substituents into a reactor with ammonia and a gas containing oxygen and ammoxidizing POC in the presence of a catalyst, at least a portion of the unreacted POC and a mononitrile compound of an intermediate product in the reaction gas discharged from the reactor is separated, recovered and recycled to the reactor so that the flow rate of the mononitrile compound at the outlet of the reactor is 2 to 16% by mole of the total flow rate of POC and the mononitrile compound supplied to the reactor. Burning reaction of the side reaction is suppressed and the loss of POC can be decreased without adverse effects on productivity and the polynitrile compound can be obtained at a high yield.

Process for producing a polynitrile compound

There is herein disclosed a process for preparing a lactamide by hydrating lactonitrile in the presence of a catalyst mainly comprising a manganese oxide, and a nitrogen-containing compound such as ammonia or diethylamine. According to this process, the lactamide can be obtained from lactonitrile in a high yield, while the high activity of the catalyst is maintained for a long period of time.

Process for preparing lactamide

A process for producing 3-methyltetrahydrofuran, wherein in a first step, prussic acid is reacted with methyl methacrylate to produce methyl 3-cyanoisobutyrate. The methyl 3-cyanoisobutyrate is then reacted with water and sulfuric acid to produce a resultant product which is reacted with a C.sub.1 -C.sub.8 aliphatic alcohol to produce a methylsuccinic acid ester. The methylsuccinic acid ester is catalytically hydrogenated to prepare the 3-methyltetrahydrofuran. Alternatively, the methyl 3-cyanoisobutyrate is hydrated to produce methyl 3-carbamoylisobutyrate, which is then reacted with a formic acid ester to form a methylsuccinic acid ester and formamide and the resultant methylsuccinic acid ester is catalytically hydrogenated. The 3-methyltetrahydrofuran is produced in high selectivity and in a commercially advantageous manner from inexpensive reactants. The 3-methyltetrahydrofuran is useful as a commoner for producing polyether glycol, which is utilized as starting raw material for preparing spandex fiber.

Process for producing 3-methyltetrahydrofuran

A liquid crystal display panel in which a liquid crystal composition is held between a pair of transparent substrates and the peripheral edges of both the substrates are sealed with a sealing material comprising (a) a partially esterified epoxy (meth)acrylate resin where 10-90% of an equivalent of the epoxy group of a bisphenol A type epoxy resin is (meth)acrylated, (b) a photopolymerization initiator, and (c) a thermosetting agent; and a sealing material for the liquid crystal display panel comprising the above-mentioned components (a), (b) and (c).

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Niigata, Japan

Fumio Tanaka