Preparation method and device of raw materials needed in preparing acetic anhydride by carbonylation
A technology for producing acetic anhydride and carbonylation, which is applied in the field of oxo-synthesis reaction to prepare acetic anhydride, which can solve the problems of increased energy consumption of methyl acetate and high reflux ratio, and achieve the effects of reduced energy consumption, reduced raw material requirements, and simple processing methods
Active Publication Date: 2012-11-28
SINOPEC NANJING ENG & CONSTR
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Problems solved by technology
Use reactive distillation tower to make high-purity methyl acetate needs higher reflux ratio, and also need to increase another separating tower (seeing the patent that application number is 200810053554.2) except reactive distillation tower, so just increased methyl acetate preparation energy consumption
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[0023] The preparation device and flow process of the raw materials required for the production of acetic anhydride by carbonylation are as follows: figure 1 As shown, it includes reactive distillation tower 1, recovery tower 2 and batching kettle 3; the bottom material outlet of reactive distillation tower 1 communicates with the middle material inlet of recovery tower 2 through pipelines, and the top material outlet of reactive distillation tower 1 passes through pipelines It communicates with the material inlet of the batching kettle 3; the inside of the batching kettle 3 is provided with a stirring device, the upper part of the batching kettle 3 is provided with an auxiliary material inlet, and the bottom is provided with a carbonylation raw material outlet.
[0024] The reactive distillation column includes a rectification section, an extraction section, a reactive distillation section and a stripping section. The trays of the reactive distillation section (reaction sectio...
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The invention discloses a preparation method and a device of raw materials needed in preparing acetic anhydride by carbonylation. The method comprises the following steps: adding the acetic acid, liquid catalyst and methanol into a reaction rectification tower respectively from the upper part, the middle-lower part and the lower part of the reaction rectification tower to carry out esterificationreaction and rectify and separate the products; introducing the materials at the bottom part of the rectification tower to a recovery tower from the central part of the recovery tower, and separatingand recycling methanol and water which contains catalyst; introducing the products on the top part of the reaction rectification tower into a dosing kettle; adding methyl iodide, acetic acid and acetic anhydride into the dosing kettle; and carrying out mixing pretreatment at the temperature of 70-100 DEG C to obtain the raw materials which are needed in preparing acetic anhydride by carbonylationand contain methyl acetate, acetic acid, methyl iodide and methanol. The invention reduces the separation requirement of the rectification tower, reduces energy consumption and improves economic efficiency.
Description
technical field [0001] The invention belongs to the field of oxo synthesis reaction for preparing acetic anhydride, and in particular relates to a process and a device for preparing methyl acetate in a reactive distillation tower, pretreatment mixing, and hydration reaction for preparing oxo reaction raw materials. Background technique [0002] Acetic anhydride is an important organic chemical raw material. It is mainly used as an acetylating agent, and can also be used as a dehydrating agent and solvent. It can also be used to produce cellulose acetate, which is more widely used in medicine, dyestuffs, agriculture, light industry, and textiles. and industry etc. The oxo synthesis method of acetic anhydride is a new process developed in the 1980s. It is characterized by low energy consumption, low cost, no pollution, and is conducive to large-scale production. The preparation of raw materials for the production of acetic anhydride is particularly important. The reaction of ...
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IPC IPC(8): C07C53/12C07C51/56B01D3/16
Inventor 马炯李蒙付宗化李宝杰蒋燕
Owner SINOPEC NANJING ENG & CONSTR