RU96109707A

RU96109707A - METHOD FOR PRODUCING ACETIC ACID BY CARBONILING

Info

Publication number: RU96109707A
Application number: RU96109707/04A
Authority: RU
Inventors: Джеймс Бейкер Майкл; Шермэн Гарлэнд Карл; Фрэнсис Гайлс Мартин; Джеймс Маскетт Майкл; Рафелетос Георгиос; Джеймс СМИТ Стивен; Гленн Санли Джон; Джон Уатт Роберт; Лео Вилльямс Брюс
Original assignee: Бп Кемикэлз Лимитед
Priority date: 1995-06-21
Filing date: 1996-05-13
Publication date: 1998-08-20

Claims

1. A method for producing acetic acid, comprising (1) continuously supplying methanol and / or a reactive derivative thereof and carbon monoxide to a carbonylation reactor, which contains a liquid reaction mixture including an iridium carbonylation catalyst, methyl iodide cocatalyst, water in a limited concentration, acetic acid, methyl acetate and at least one promoter; (2) introducing methanol and / or its reactive derivative into contact with carbon monoxide in a liquid reaction mixture to obtain acetic acid; and (3) separating acetic acid from the liquid reaction mixture, characterized in that during the course of the reaction, the liquid reaction mixture is constantly maintained (a) the concentration of water is not more than 6.5 wt.%, (b) the concentration of methyl acetate in the range of 1-35 wt.% and (c) the concentration of methyl iodide in the range of 4-20 wt.%.

2. The method according to p. 1, in which during the interaction in the liquid reaction mixture constantly maintain a water concentration of not more than 6 wt.%.

3. The method according to p. 1 or 2, in which during the interaction in the liquid reaction mixture constantly maintain a water concentration of at least 0.1 wt.%.

4. The method according to p. 3, in which during the interaction in the liquid reaction mixture constantly maintain a water concentration of at least 1 wt.%.

5. The method according to any one of the preceding paragraphs, in which during the interaction the concentration of methyl acetate in the liquid reaction mixture is constantly maintained within the range of 1-30 wt.%.

6. The method according to p. 5, in which during the interaction the concentration of methyl acetate in the liquid reaction mixture is constantly maintained in the range of 5-25 wt.%.

7. The method according to any one of the preceding paragraphs, in which during the interaction the concentration of methyl iodide in the liquid reaction mixture is constantly maintained in the range of 5-16 wt.%.

8. The method according to any one of the preceding paragraphs, in which at least one promoter is selected from the group consisting of ruthenium, osmium, rhenium, cadmium, mercury, zinc, gallium, indium and tungsten, preferably from the group consisting of ruthenium and osmium.

9. The method according to p. 8, in which the molar ratio of promoter: iridium is (0.5-15): 1.

10. The method according to p. 1, in which during the interaction in the liquid reaction mixture constantly maintain a content of approximately 5 weight. % water, about 7 weight. % methyl iodide, about 15% methyl acetate, the concentration of the iridium catalyst in the range of 400-3000 ppm and the concentration of the ruthenium promoter in the range of 400-4000 ppm.