化學(xué)工程與工藝外文英文文獻(xiàn)翻譯醋酐生產(chǎn)工藝-全文預(yù)覽
【正文】 record. According to the legal provisions, to undocumented units 200 kg acetic anhydride, will be sentenced to 3 years imprisonment. Industrialization of acetic anhydride production process has three kinds: the oxidation of acetaldehyde, ethylene ketone and methyl acetate carbonylation. Acetaldehyde oxidation technology source for the Canadian Sha Winigan chemical pany. The production process is as follows: acetaldehyde and oxygen at 60 degrees C, 101 kPa or 70 degrees C, 600700kPa under the conditions of the oxidation reaction, oxygen or air as the oxidant, using ethyl acetate as solvent, cobalt acetate as catalyst, acetic acid copper as promoter. Acetaldehyde and oxygen ( in excess of about 1%2%) reaction is first generated peroxy acetic acid, acetic acid and acetaldehyde reaction of acetic anhydride and acetic acid. Under this 1 condition, the conversion rate of acetaldehyde acetic anhydride and acetic acid production rate is 95%, the mass ratio of 56: 44. The total yield of 70%75% acetic anhydride. By changing the processing conditions, can improve the yield of acetic anhydride. Reaction equation: CH3CHO+O2 CH3COOOH。 / m3, can change a person39。 CH3COOOCH ( OH CH3 2CH3COOH ). Acetaldehyde acetic anhydride consumption per ton of T, 2300 m3 standard air. Acetaldehyde oxidation method has the advantages of simple process, technology is mature, but the serious corrosion, high consumption, has gradually been eliminated. In foreign countries have been carbonylation of methyl acetate and vinyl ketone method alternative. China Shanghai Chemical Reagent Factory of this device has been in a state of production. Vinyl ketone law in accordance with the different materials can be divided into: acetic acid and acetone method. Acetic acid process technology from Germany Wacher chemical pany. The production process is as follows: in the first step, the acetic acid in 700750 C, 1020kPa pressure and %% phosphoric acid three ethyl ester (by acetic acid quality plan) as catalyst under the conditions of dehydration, cracking ethylene ketone acetate made, conversion rate is about 85%90%, on vinyl ketone selectivity (corporeal quantity meter ) is about 90%95%. Reaction equation: CH3COOH CH2 = C = O+H2O+147 kJ / mol. The second step is to absorb liquid acetic acid ethylene ketone anhydride generating, by distillation and purification to obtain the product of acetic anhydride, vinyl ketone conversion rate of about 100%. Reaction equation: CH3COOH+CH2 = C = O ( CH3CO ) 2O+ / mol. 2 The production process is a German Wacher chemical pany to develop a success, and in 1936 achieved industrialization. Two existing production process: One, as the tower process. Using 4 packed tower for synthesis and separation. The consumption of per ton of acetic anhydride as catalyst, acetic acid , 100160kg, ammonia, acetic acid recovery. Secondly, as the liquid ring pump flow. The liquid ring pump for reaction and absorption equipment. The process is simple, being replaced by tower process. Per ton of products consumption quota for acetic acid
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