化學工程與工藝外文英文文獻翻譯醋酐生產(chǎn)工藝-wenkub
2022-12-17 09:21:34 本頁面
【正文】 ction liquid catalyst recovery. Gas phase process can reduce the loss of rhodium, rhodium is fixed on the carrier without the accident was washed out in the solution. Gas phase process in terms of investment is better than that of liquid phase process, but the project cost is higher. In 2021, Dan group of Jiangsu, Chinese Academy of Sciences and Beijing University three homes, built up the first set of acetic anhydride carbonylation synthesis device, device dimensions is 20210 t / a acetic 4 anhydride . The device can also adjust the production of methyl acetate by Lanzhou Petrochemical Design Institute, engineering general contracting and design, production of acetic anhydride purity of the product reached more than %, more than % of methyl acetate. A ton of acetic anhydride consumption quota for methanol acetic acid T, , CO for , Z catalyst , steam T, 147 t water, electric 167kwh, instrument air 300m3. Device operation practice proves, developed by China in this set of acetic anhydride production process is reliable. Acetic anhydride carbonylation synthesis process, reactor by esterification and the carbonylation reactor, methanol and acetic acid in the esterification reactor to generate methyl acetate, methyl acetate in carbonylation reactor and CO synthesis of acetic anhydride. Because the process of catalyst in water, generation acetic anhydride at the same time, also generates a part of acetic acid. The processes for the production of acetic anhydride mainly, main raw material for CO and methanol, acetic acid. In addition, the process also can directly use the raw materials of methanol and CO in the carbonylation reactor in response to acetic acid, without esterification device. Therefore, the process can be based on market demand for acetic acid, methyl acetate and acetic anhydride products switch. by carbonylation catalyst technology is the most important, Institute of Chemistry Chinese Academy of Sciences after years of research and development and development of the domestic catalyst multidentate Ji Ji heterozygous rhodium plexes catalyst. And the United States Monsanto developed catalyst, the catalyst has a water content of less. From Jiangsu, the Dan group use, reaction conditions and catalyst abroad basically the same ( reaction pressure 36MPa, temperature 160200 C ), an ideal application. In addition to using rhodium catalyst, the carbonylation synthesis of acetic anhydride process can also be used for other metal catalysts. Although the rhodium catalyst catalytic activity and selectivity for the best, but there are expensive, shortage of resources, recycling costs higher shorting. Therefore, many panies have shifted their attention to non noble metal catalysts, which are mainly I A III A B or B, VI, VIII nonnoble metals. Among them, nickel catalyst in the reaction conditions such as mild and catalytic properties are obviously superior to other nonnoble metal, is a kind of the most development prospect of non noble metal catalysts. Vinyl ketone and carbonyl synthesis process is the production of acetic anhydride used method. From the contrast can be seen in Tab
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