Chiyoda Corporation

Yasuo Hosono

Takeshi Minami

Yoichi Umehara

Tadashi Matsumoto

Susumu Yamamoto

Haruto Kobayashi

Zhixiong You

Tetsuro Matsumura

Chikako Hashimoto

Chieko Nagasawa

Munenori Maekawa

Chunji Yin

Rei Sato

According to a method for producing acetic acid by carbonylation of methanol characterized in that an acid having an acid dissociation constant (pK) smaller than the constant of acetic acid is allowed to be present in the reaction system, acetic acid can be produced by the reaction of methanol and carbon monoxide in a reaction liquid in the presence of a solid catalyst containing rhodium and alkyl iodide, to achieve an enhanced reaction rate of carbonylation of methanol in producing acetic acid in the region at a high carbonylation degree (Ca&#x3e;0.8 mol/mol) for more efficient production of acetic acid.

Method of accelerating methanol carbonylation

An iodide compound is adsorbed and removed from an organic acid containing the iodide compound as an impurity by passing the organic acid through a packed bed of a cation-exchange resin having silver ion carried thereon at 50&#xb0; C. or lower. The cation-exchange resin is a macroporous-type resin with an average particle size of 0.3 to 0.6 mm and an average pore size of 15 to 28 nm, and silver ion substitutes for 40 to 60% of the active site.

Method for removing iodide compound from organic acid

Acetic acid is manufactured by carbonylating methanol with carbon monoxide by way of a heterogeneous catalytic reaction in a bubble column reactor. The carbonylating reaction is conducted with a solid catalyst concentration of not less than 100 kg/m3 in terms of the reaction volume. For the reaction, the partial pressure of carbon monoxide in the reactor is confined to a range between 1.0 and 2.5 MPa while the exhaustion ratio of carbon monoxide is confined to a range between 3 and 15% of the theoretical reaction volume of carbon monoxide and the liquid superficial velocity is made to be found in a range between 0.2 and 1.0 m/sec.

Method of manufacturing acetic acid

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Yokohama, Japan

Yasuo Hosono