Reactive distillation process for heavy component residue liquid produced in process of producing acetic acid through carbonylation

Abstract

The invention provides a reactive distillation process for heavy component residue liquid produced in process of producing acetic acid through carbonylation. The reactive distillation process comprises the following steps that 1, the content of acetic acid, ethylene glycol diacetate and acetoxyacetic acid of the heavy component residue liquid is sampled and analyzed, and the content for complete acetic acid conversion is worked out; 2, heavy component residue liquid, methyl alcohol and sulfuric acid are added into a heavy component rectifying tower storage tank; 3, a heavy component reboiler heats a heavy component rectifying tower kettle through a control valve, gas-liquid mass transfer is carried out on the gas phase and the liquid phase in the heated materials, gas phase materials are condensed through a condenser and then pass through a reflux ratio controller, one part of the materials achieve reflux, the content of methyl acetate in the top of a sampling analysis tower is in a qualified range, one part of qualified products enter an ester receiving tank, a transition distillate tank and an acetoxyl group acetic acid buffer tank, and heating is stopped when no material exists on the tower top for extraction. The recycle separation method is low in energy consumption and high in acetic acid yield, and a small quantity of solid waste residues are obtained after rectification treatment.

Description

technical field [0001] The invention belongs to the field of raw material production of fine chemical products, and in particular relates to a reactive distillation process for heavy component raffinate in the carbonylation process of producing acetic acid. Background technique [0002] As an important organic raw material, acetic acid is mainly used in the production of vinyl acetate, acetate esters, cellulose acetate, polyvinyl alcohol, etc.; at the same time, as a solvent in the production of PTA in the polyester industry, the annual consumption of acetic acid is very large. [0003] Methanol carbonylation to acetic acid is a relatively leading method in the world today. At present, domestic manufacturers have adopted this technology to produce acetic acid. [0004] However, the heavy component raffinate produced in the process of producing acetic acid will be mixed with a large amount of acetic acid, and the acetic acid in the raffinate needs to be purified, otherwise th...

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Problems solved by technology

[0013] 1. The process is complicated and there are many processing techniques;

[0014] 2. The energy consumption is relatively large, high vacuum is required, and more steam is consumed

[0015] 3. The product content and yield are low, and rectification can only purify 20% of the acetic acid in the heavy component raffinate;

[0016] 4. A lot of solid waste is generated. Originally, only 20% of the acetic acid in the raffinate was purified, and the rest of the tower kettle was treated as fuel oil (it was too late for the boiler to be consumed). Some of them could only be sold, and the fuel oil was fuel surcharge

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