Mitsubishi Gas Chemical Company, Inc.

Yuh Miyauchi

Yasuhiko Kijima

Tomiya Isshiki

Takao Kondo

Takao Kawaki

Tetsuo Koshitsuka

Takahiro Cho

Takamasa Fukushima

Akiyo Shimada

Takayuki Watanabe

Fumiya Zaima

Hiroshi Ogawa

Katsushige Hayashi

Toshio Watanabe

Toru Nakajima

Mituhiko Masumoto

Satoshi Ueno

Takayuki Yasunaga

Eizi Ukita

Takao Konko

Akiro Ito

A process for bleaching chemical pulp for paper manufacturing comprising delignifying and bleaching chemical pulp which has been treated by cooking by simultaneous use of chlorine dioxide, a peroxide, and at least one reaction catalyst selected from the group consisting of oxoacids of elements of Groups IV, V and VI and salts of these acids. Formation of organic chlorine compounds as by-products is suppressed by decreasing the amount of chlorine dioxide used in the ECF bleaching process in the first stage, and thus environmental toxicity in the waste water discharged from the bleaching process is decreased. Chemical pulp having a high degree of brightness is economically produced because increase in the production capacity is not required at all or suppressed to the minimum, and the investment cost is reduced to the minimum when the bleaching with chlorine in the first stage is converted into the bleaching with chlorine dioxide which is an ECF bleaching process.

Process for bleaching chemical pulp simultaneously with chlorine dioxide, peroxide and a reaction catalyst

Process for bleaching chemical pulp with chlorine dioxide, peroxide and

A process for producing a carboxylated compound, which comprises reacting a carbonyl compound with hydrogen peroxide in the presence of an organo-arsenic acid of the formula (1), ##STR1## wherein: R.sup.1 is a C.sub.1 -C.sub.12 alkyl group which may be substituted or an aryl group which may be substituted,

Process for producing carboxylated compound

A process for producing vinyl acetate which comprises reacting acetic anhydride with hydrogen in the presence of a catalyst comprising

Process for producing vinyl acetate

A resin composition for optics is disclosed, which mainly comprises a graft copolymer comprising a styrene resin and an aromatic polycarbonate each having a specific molecular weight at a specific ratio of molecular weight and weight, said composition having a micro disperse phase of not more than 0.5 .mu.m. The resin composition has a reduced optical strain and an excellent micro disperse phase and is, therefore, suitable for use as optics.

Molding material for optics

A process for producing ethylidenediacetate which comprises reacting methyl acetate or dimethyl ether, carbon monoxide and hydrogen in the presence of catalyst comprising as a secondary-component at least one material selected from the group consisting of, iodides and bromides and as a main component combination of (1) at least one material selected from the group consisting of nickel and nickel compounds, at least one material selected from the group consisting of cobalt and cobalt compounds under substantially anhydrous conditions is disclosed. According to the present invention synthesis of ethylidenediacetate is achieved by using a cheaper catalyst than the prior catalyst.

Process for producing ethylidenediacetate

A process for producing a carboxylic acid which comprises reacting a hydrocarbyl alcohol with carbon monoxide in the presence of a metal catalyst selected from nickel or cobalt, a halide and a specific promoter is disclosed. According to the present invention, formation rate of carboxylic acid is high.

Process for producing carboxylic acids

A process for producing acetic anhydride which comprises reacting methyl acetate or dimethyl ether with carbon monoxide in the presence of a catalyst comprising (a) nickel or a nickel compound and (b) at least one halide selected from the group consisting of bromides, iodides and mixtures thereof, and together with a specific co-catalyst which is disclosed. According to this invention acetic anhydride is produced by using highly active non-expensive catalyst and co-catalyst.

Process for producing acetic anhydride

A process for producing acetic anhydride which comprises reacting methyl acetate or dimethyl ether with carbon monoxide in the presence of a catalyst comprising (a) nickel or a nickel compound, (b) at least one halide selected from the group consisting of bromides, iodides and mixtures thereof and (c) at least one organic nitrogen group compound and together with a specific co-catalyst is disclosed. According to this invention acetic anhydride is produced by using highly active non-expensive catalyst and co-catalyst.

A process for producing a carboxylic acid and/or its ester, which comprises reacting an alcohol or ether with carbon monoxide in the presence of elemental nickel or a nickel compound, iodine or an iodine compound and an organic compound of a trivalent nitrogen-group element; wherein the iodine or iodine compound is selected from the following formulae (I) to (IV),

Process for producing carboxylic acids and/or esters thereof

A process for preparing a carboxylic acid anhydride by reacting an aliphatic carboxylic acid ester or an ether with carbon monoxide in the presence of elemental nickel or a nickel compound, iodine or an iodine compound and an organic compound of a trivalent nitrogen-group element; wherein said iodine or iodine compound is selected from the following formulae (I) to (IV),

Process for preparing carboxylic acid anhydrides

A process for producing an aliphatic carboxylic acid and an aliphatic carboxylic acid esters ofa phenol which comprises reacting a phenol of the general formula ##STR1## wherein n is an integer of 1 to 6, m is an integer of 0 to 5, the sum of n and m is 6, and R represents hydrogen, alkyl, aryl, alkenyl, carbinol, acyl, acyloxy, formyl, carboxy, halogen, sulfo, nitro, nitroso, amino, amido, or cyano, and two or more R groups may be the same or different, and the substituents R may be bonded to each other to form a penta- or hexa-carboxylic or heterocyclic ring, and an aliphatic carboxylic acid ester or an aliphatic ether with carbon monoxide, and separating and recovering the aliphatic carboxylic acid from the reaction mixture.

Process for producing aliphatic carboxylic acids and aliphatic

In a process for producing a carboxylic acid or its ester by reacting an alcohol or an ether with carbon monoxide, the improvement wherein the reaction is performed in the presence of, as a solvent, an aryl ester of an aliphatic carboxylic acid represented by the formula ##STR1## wherein n is an integer of 1 to 5, R.sub.1 represents hydrogen or C.sub.1 -C.sub.4 alkyl or alkenyl, and R.sub.2 represents hydrogen, alkyl, aryl, alkenyl, hydroxymethyl, acyl, acyloxy, formyl, carboxy, hydroxy, halogen, sulfo, nitro, nitroso, amino, acid amide or cyano, and two or more R.sub.2 groups may be the same or different, and the substituents R.sub.2 may be bonded to each other to form a penta- or hexa-carbocyclic or heterocyclic ring.

Growing community of inventors

Tokyo, Japan

Yuh Miyauchi