Kuraray Co., Ltd.

Takanori Kitamura

Masuhiko Tamura

Hisamichi Yanai

Akimasa Aoyama

Takeshi Moritani

Fumio Nakahara

Katsumi Shimizu

Noriaki Yoshimura

Mitsuo Matsumoto

Tadashi Matsunaga

Naoshi Nakagawa

Eiji Tanaka

Yoichi Matsumoto

Hiroaki Fujii

Shinji Komori

Tadao Shiotani

Kunio Abe

Naoto Narumoto

Masanobu Abe

Tamio Higashi

Yuji Takenouchi

Takanori Tsugiya

Takeshi Matsuda

Yuuji Takenouchi

A waste water treatment apparatus which is compact, and excellent in durability, has a high treatment performance and can stably operate for a long time is provided. In a waste water treatment apparatus at least comprising a waste water treatment tank in which a carrier particle immobilizing a microbe is charged and decomposing and eliminating an organic matter and/or an inorganic matter contained in a waste water, and a membrane module for filtrating a water to be treated which flows out from said treatment tank, a non-permeating water not passing thorough the membrane module is returned and circulated to said treatment tank. In a waste water treatment apparatus at least comprising a waste water treatment tank in which a carrier particle immobilizing a microbe is charged and decomposing and eliminating an organic matter and/or an inorganic matter contained in a waste water, a carrier immobilizing a microbe is an acetalized polyvinyl alcohol hydrogel.

Waste water treatment apparatus

The present invention provides a polyvinyl alcohol powder which comprises a pore having an average diameter of 0.1 to 10 .mu.m in the range of 0.05 to 0.4 cc/g. Since the PVA powder of the present invention has an excellent solubility in water, an aqueous solution thereof can easily be prepared industrially. Since the PVA powder of the present invention has a low content of an organic volatile component and a low content of a nonvolatile component such as a carboxylic acid salt or the like which is derived from a basic catalyst, it has an excellent industrial handleability.

Polyvinyl alcohol powder

A process for producing L-phenylalanine at high rates of formation and in good yields is provided which comprises allowing a microorganism which belongs to the genus Nocardia and is capable of producing L-phenyl-alanine from phenylpyruvic acid or a salt thereof and an amino group donor to act upon an aqueous solution containing phenylpyruvic acid or a salt thereof and an amino group donor selected from the group consisting of ammonium salts and ammonia in a hydrogen gas atmosphere.

Process for producing L-phenylalanine

Process for producing ethylene-vinyl ester copolymers using a polymerization solvent of a dialkyl sulfoxide (process X); process for producing ethylene-vinyl alcohol copolymer by liquid phase saponification using a solvent of a dialkyl sulfoxide (process Y); and process for producing shaped articles which comprises contacting the ethylene-vinyl alcohol copolymer obtained by the process Y, or that obtained by saponifying the ethylene-vinyl ester copolymer obtained by process X, to a non-solvent for ethylene-vinyl alcohol copolymer. Ethylene-vinyl ester copolymers having a wide range of ethylene content and higher degree of polymerization than that with solution polymerization using methanol. The rate of saponification is higher than that with single solvent system of lower alcohol. Production cost is low, because production process of polymer is directly connected to that of shaped articles utilizing the polymer.

Process for producing ethylene-vinyl ester copolymers, ethylene-vinyl

Process for producing ethylene-vinyl alcohol copolymers

The polyvinyl alcohol of the present invention is a partially saponified polyvinyl alcohol having a saponification degree of 70 to 98 mol % and containing a larger amount of methanol-soluble substances than that contained in polyvinyl alcohols having the same saponification degree obtained by known processes, and is novel. And, the process for producing polyvinyl alcohol of the present invention comprises saponifying polyvinyl esters in a solvent of a polyoxyalkylene ether having in the molecule thereof a structural unit represented by the general formula [I]:

Novel polyvinyl alcohol and process for producing polyvinyl alcohol by

There is provided a method of producing L-phenylalanine in high optical purity which comprises treating an N-acylphenylalanine alkyl ester in L form, in the presence of water, with an enzyme capable of hydrolyzing the N-acylphenylalanine alkyl ester in L form to give L-phenylalanine.

Method of producing L-phenylalanine

There is provided a process for producing propylene glycol monoacetate which comprises the steps of

Process for producing propylene glycol monoacetate

A process for producing methyl lactate by (I) hydroformylating vinyl acetate or vinyl propionate with a gaseous mixture of hydrogen and carbon monoxide in an organic solvent in the presence of a substantially water-insoluble rhodium complex and a tri-substituted phosphine to form .alpha.-acetoxy- or propionyloxy-propionaldehyde, (II) subjecting at least part of the reaction mixture obtained in step (I) to extraction with an aqueous medium to obtain an aqueous layer containing .alpha.-acetoxy- or propionyloxy-propionaldehyde and an extraction residue containing the catalyst components, and recycling the extraction residue to the hydroformylation step (I), (III) separating .alpha.-acetoxy- or propionyloxy-propionaldehyde from the aqueous layer containing the same as obtained in step (II), (IV) oxidizing .alpha.-acetoxy- or propionyloxy-propionaldehyde obtained in step (III) in the liquid phase with oxygen gas or an oxygen-containing gas in the presence of an oxidation catalyst to form .alpha.-acetoxy- or propionyloxy-propionic acid, and (V) reacting .alpha.-acetoxy- or propionyloxy-propionic acid obtained in step (IV) with methanol in the presence of an acid catalyst, and recovering the resultant methyl lactate by distillation.

Process for producing methyl lactate

A method of producing liquid hydrocarbons useful e.g. as lubricants or base oils for cosmetics is disclosed. The method comprises copolymerizing in the presence of an aluminum halide catalyst (i) at least one alpha-olefin having a terminal vinyl group and containing 6 to 14 carbon atoms, (ii) isobutylene and/or diisobutylene, and optionally (iii) 1-butene, coexisting in a specified ratio, and optionally hydrogenating the resulting polymer.

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Kurashiki, Japan

Takanori Kitamura