Phosphate preparation equipment and preparation method thereof

Abstract

The invention relates to phosphate preparation equipment and a preparation method thereof. The equipment comprises a multi-stage esterification reaction unit, a dealcoholization device and a gas washing device for recovering hydrogen chloride and monohydric alcohol, and the multi-stage esterification reaction unit is formed by connecting a plurality of esterification reaction units in series in sequence; wherein a raw material input port of the esterification reaction unit at the head part is connected with a raw material output port of a gas washing device, and a mixture input port of the gas washing device is used for being connected with the esterification reaction units and the mixture output port of the dealcoholization device in parallel; and the raw material input port of the dealcoholization device is connected with one esterification reaction unit positioned at the tail part. According to the invention, unreacted monohydric alcohol entrained during volatilization of hydrogen chloride is recovered by utilizing the gas washing device, phosphorus oxychloride entrained in absorption liquid during volatilization of hydrogen chloride is absorbed by industrial hydrochloric acid water, and then volatile hydrogen chloride is absorbed by industrial water, so that industrial-grade qualified byproduct hydrochloric acid can be prepared, waste of raw materials is reduced, and the yield of waste gas, waste water and solid waste is also reduced.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a phosphate ester preparation equipment and a preparation method thereof. Background technique [0002] Phosphate esters can be used as extraction agents for rare metals, solvents, plasticizers for chlorinated rubber and polyvinyl chloride, and industrial defoamers. [0003] The traditional preparation methods of phosphine and monohydric alcohols to prepare phosphate esters all adopt esterification section, alkali neutralization, dealcoholization section and rectification separation section, which are usually determined from reaction temperature, reaction mixing mode, reaction time, and use Ratio of raw material phosphoric acid ester and monohydric alcohol etc. method is improved, but the problem of above-mentioned improved method in reaction is to form hydrogen chloride, therefore must remove hydrogen chloride rapidly and completely from reaction mixture material, avoids the for...

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Problems solved by technology

[0005] (1) If the temperature used to remove hydrogen chloride is high, the hydrogen chloride after gasification and condensation will be absorbed by monohydric alcohol, and the monohydric alcohol will be recovered to participate in the secondary esterification reaction, thereby affecting the reaction conversion rate; using the increased temperature to remove hydrogen chloride will cause a certain amount High-boiling phosphoric acid is produced, so that the reaction material will cause pyrolysis during distillation, which is also not conducive to the production of phosphate ester, resulting in a considerable loss of monohydric alcohol

[0006] (2) Alkali neutralization reaction is adopted to absorb hydrogen chloride and phosphoric acid in the mixed material with a solvent. Although the use of alkali neutralization reaction has avoided the acidolysis of the reaction product, the neutralization of the reaction mixture has increased the cost of neutralizing the alkali, and at the same time A large amount of waste water is also produced, and the up-to-standard treatment of waste water increases the production cost, and also produces solid waste, causing serious pollution

[0007] (3) Since the monohydric alcohol has a certain solubility in water, some monohydric alcohol remains in the neutralized water, which leads to the loss of raw materials

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