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首页> 外国专利> Producing acrylic acid, useful as superabsorbent, comprises dehydrating glycerol in presence of dehydration catalysts to obtain gaseous acrolein phase and oxidizing acrolein in presence of oxidation catalyst to gaseous acrylic acid phase

Producing acrylic acid, useful as superabsorbent, comprises dehydrating glycerol in presence of dehydration catalysts to obtain gaseous acrolein phase and oxidizing acrolein in presence of oxidation catalyst to gaseous acrylic acid phase

机译：生产用作超吸收剂的丙烯酸包括在脱水催化剂存在下使甘油脱水以获得气态丙烯醛相，并在氧化催化剂存在下将丙烯醛氧化成气态丙烯酸相。

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Producing acrylic acid from glycerol comprises (a) dehydrating glycerol to acrolein in the gas phase in a dehydration unit in the presence of dehydration catalysts to obtain a gaseous acrolein phase and (b) oxidizing the acrolein in an oxidation unit (9) in the presence of oxidation catalysts to obtain a gaseous acrylic acid phase. The dehydration unit includes two catalyst portion separated from each other and having different catalyst activity. The first catalyst portion catalyzes the dehydration of glycerol to the formation of acrolein, while the second catalysis portion is regenerated. Independent claims are included for: (1) a device for producing acrylic acid from glycerol, comprising (A) an evaporation unit (1) including at least an evaporator, (B) a dehydration unit containing (B1) at least one dehydration reactor and (B2) at least one regenerator, where both the dehydration reactor and the regenerator include a dehydration catalyst, (C) an oxidation unit comprising at least an oxidation reactor that includes an oxidation catalyst, (D) optionally a condensing unit (15) containing at least a capacitor that is located between the dehydration unit (B) and the oxidation unit (C) and (E) optionally an analysis device (7) for the determination of glycerol-turnover in the dehydration unit (B); and (2) use of a Riser-Downer-reactor system in the conversion of glycerol to acrolein.
机译：由甘油生产丙烯酸包括（a）在脱水催化剂存在下在脱水单元中在气相中将甘油脱水为丙烯醛以获得气态丙烯醛相和（b）在存在下在氧化单元（9）中氧化丙烯醛。氧化催化剂以得到气态丙烯酸相。脱水单元包括彼此分开并且具有不同催化剂活性的两个催化剂部分。第一催化剂部分催化甘油脱水以形成丙烯醛，而第二催化剂部分被再生。包括以下独立权利要求：（1）一种由甘油生产丙烯酸的装置，其包括（A）蒸发单元（1），其至少包括蒸发器;（B）脱水单元，其包含（B1）至少一个脱水反应器;和（B2）至少一个再生器，其中脱水反应器和再生器均包括脱水催化剂;（C）氧化单元，其至少包含氧化反应器，该氧化反应器包括氧化催化剂;（D）任选地，冷凝单元（15）包含至少一个位于脱水单元（B）与氧化单元（C）和（E）之间的电容器，可选地，具有分析装置（7），用于确定脱水单元（B）中的甘油转化率; （2）在甘油向丙烯醛的转化中使用Riser-Downer-反应器系统。

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