Sumitomo Chemical Company, Limited

Furuya Metal Co., Ltd.

Kohei Seki

Tetsuya Suzuta

Tatsuya Suzuki

Takuo Hibi

Tomohiro Maruko

Hiroaki Abekawa

Kiyoshi Iwanaga

Naoki Miura

Nobufumi Watanabe

Kazuaki Yoshimura

Keisuke Tanaka

Youhei Uchida

Takahiro Oizumi

Masashi Teramori

Yoshinari Hirai

There is disclosed a process for producing chlorine by feeding hydrogen chloride and oxygen into catalyst beds which are formed in the reaction tubes of a fixed-bed multitubular reactor and which contain catalysts for use in oxidation of hydrogen chloride, and this process is characterized in that the catalyst beds in one reaction zone in the fixed-bed multitubular reactor are catalyst beds formed by packing catalysts of a plurality of production lots; and in that the catalysts of the plurality of production lots satisfy the following condition (I): Condition (I): a value of AB is smaller than 1.20 (with the proviso that A and B are values of three significant figures, having a relationship of A&#x2265;B), wherein the pore volume of a catalyst of one production lot optionally selected from the plurality of production lots is A [ml/g], and the pore volume of another one production lot is B [ml/g].

Process for producing chlorine

A method for producing &#x3b5;-caprolactam involves a step of Beckmann-rearranging cyclohexanone oxime in a gas phase in the presence of a zeolite catalyst containing silicon and at least one element selected from alkaline earth metal elements and magnesium. The concentration of the above-described element in the zeolite catalyst is 3 ppm by mass or more and 10000 ppm by mass or less.

Production method of &#x3f5;-caprolactam

A method for producing chlorine by oxidizing hydrogen chloride with oxygen in the presence of a catalyst, wherein the catalyst satisfies the following conditions (i) and (ii): (i) the BET specific surface area is from 1 to 250 m/g; and (ii) the value of H/D, wherein H is the half width of the peak of a pore distribution curve as determined by a mercury intrusion method; and D is the average pore diameter, is from 0.6 to 1.5.

Method for producing chlorine and catalyst

Production of methacrylic acid ester comprising a step of having acetone undergo a dehydration reaction in the presence of a dehydration reaction catalyst to obtain a reaction mixture; a step of separating a mixture containing propyne and propadiene as main components from the obtained reaction mixture; a step of separating the separated mixture containing propyne and propadiene as main components into a liquid, gas, or gas-liquid mixture containing propyne as a main component, and a liquid, gas, or gas-liquid mixture containing propadiene as a main component; and a step of bringing the obtained liquid, gas, or gas-liquid mixture containing propyne as a main component into contact with carbon monoxide and an alcohol having 1 to 3 carbon atoms in the presence of a catalyst containing at least one selected from the group consisting of Group 8 metal elements, Group 9 metal elements, and Group 10 metal elements.

Method for producing methacrylic acid ester

An object of the present invention is to provide a process for recovering ruthenium at a sufficient recovery rate from a solid in which a ruthenium compound is supported on a carrier. The present invention relates to a process for recovering ruthenium, comprising the following steps (1) to (3): (1) bringing a solid in which a ruthenium compound is supported on a carrier, into contact with a reducing gas, to thereby reduce the ruthenium compound; (2) cooling the solid obtained in the step (1) to 250&#xb0; C. or lower under an atmosphere of a non-oxidizing gas; and (3) mixing the solid obtained in the step (2) with an oxidizing solution, to thereby dissolve ruthenium in the solution.

Method for recovering ruthenium

A catalyst having decreased activity is subjected to a contact treatment with a reducing gas containing carbon monoxide and/or hydrogen. Also, the catalyst can be effectively activated by being treated by contacting with an oxidizing gas after having been treated by contacting with the reducing gas. As the catalyst for production of chlorine, a ruthenium catalyst, particularly a catalyst containing ruthenium oxide is suitably activated.

Method for activating catalyst for chlorine production

There are disclosed a process for producing a ruthenium oxide-supported material, characterized in that a ruthenium compound is supported on a titania carrier in which silica is supported on titania, and the obtained material is then calcined under an atmosphere of an oxidizing gas; and a process for producing chlorine by oxidizing hydrogen chloride with oxygen in the presence of the ruthenium oxide-supported material produced by the above-described process.

Process for producing ruthenium oxide-supported material and process for producing chlorine

The present invention provides a process for producing supported ruthenium, which comprises recovering a ruthenium compound from supported ruthenium used as a catalyst in production of chlorine by oxidation of hydrogen chloride with oxygen, and supporting the ruthenium compound on a carrier; and a process for producing chlorine, which comprises producing a supported ruthenium catalyst by the process mentioned above and oxidizing hydrogen chloride with oxygen in the presence of the supported ruthenium.

Process for producing supported ruthenium and process for producing chlorine

A process for producing chlorine by oxidizing hydrogen chloride with oxygen. The process uses various supported ruthenium catalysts or a catalyst system containing (A) an active component of a catalyst and (B) a compound having thermal conductivity of a solid phase measured by at least one point within a range from 200 to 500&#xb0; C. of not less than 4 W/m. &#xb0; C.

Growing community of inventors

Niihama, Japan

Kohei Seki