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Comprehensive utilization method of low-concentration 1,4-butanediol

A butanediol and low-concentration technology, applied in the field of chemical rectification, can solve the problem of low concentration of 1,4-butanediol, and achieve the effects of creating economic value, increasing concentration and avoiding pollution

Inactive Publication Date: 2017-09-29
三惠(福建)工贸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, for the above content, the present invention provides a kind of comprehensive utilization method of low concentration 1,4-butanediol still raffinate, solves the defect that the concentration of 1,4-butanediol obtained by the purification method of the prior art is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of low-concentration 1, the comprehensive utilization method of 4-butanediol comprises the following processing steps: (1) crude distillation: the material collection containing low-concentration 1,4-butanediol is put into the reactor, in the reactor Add alkaline auxiliary agent sodium carbonate in the middle, the consumption of described sodium carbonate is 0.6wt% of still raffinate. , the reaction kettle is heated, the temperature at the bottom of the kettle is controlled at 105°C, the temperature at the top of the kettle is controlled at 50°C, the reflux ratio is controlled at 0.1, and methanol, tetrahydrofuran, and water are separated from the top of the kettle; (2) the intermediate glycol component Separation: continue heating the still liquid after step (1), so that the temperature at the bottom of the still is raised to 115°C, the temperature at the top of the still is controlled at 90°C, the reflux ratio is controlled at 0.3, and the glycol component is se...

Embodiment 2

[0021] A kind of low-concentration 1, the comprehensive utilization method of 4-butanediol comprises the following processing steps: (1) crude distillation: the material collection containing low-concentration 1,4-butanediol is put into the reactor, in the reactor Add alkaline auxiliary agent sodium carbonate, the consumption of described sodium carbonate is 0.8wt% of still raffinate, the reaction kettle is heated, and the temperature at the bottom of the still is controlled at 107 ℃, and the temperature at the top of the still is controlled at 60 ℃, and the reflux ratio is controlled at 0.13, methanol, tetrahydrofuran, and water are separated from the top of the kettle; (2) Separation of the diol component of the intermediate: continue heating the still liquid after the treatment in step (1), so that the temperature at the bottom of the kettle rises to 130°C, The temperature is controlled at 100°C, the reflux ratio is controlled at 0.35, and the glycol component is separated f...

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PUM

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Abstract

The invention relates to the technical field of chemical fractionating, and provides a comprehensive utilization method of low-concentration 1,4-butanediol. The defect of low concentration of 1,4-butanediol obtained by a purification method in the prior art is overcome. The method comprises the following treatment steps of (1) coarse distillation: substances containing low-concentration 1,4-butanediol are collected into a reaction kettle; alkali additives are added into the reaction kettle; the reaction kettle is heated; the kettle bottom temperature is controlled at 105 to 110 DEG C; the kettle top temperature is controlled at 47 to 80 DEG C; the backflow ratio is controlled at 0.1 to 0.15; methanol, tetrahydrofuran and water are separated out from the kettle top; (2) separation of intermediates of dihydric alcohol ingredients: kettle liquid treated in the step (1) is continuously heated so that the kettle bottom temperature is raised to 111 to 159 DEG C; the kettle top temperature is controlled at 90 to 110 DEG C; the backflow ratio is controlled at 0.3 to 0.4; the dihydric alcohol ingredients are separated from the kettle top; (3) fractionating.

Description

technical field [0001] The invention relates to the technical field of chemical distillation, in particular to a comprehensive utilization method of low-concentration 1,4-butanediol. Background technique [0002] 1,4-Butanediol, or BDO, is a basic chemical and fine chemical raw material, widely used in the production of PBT engineering plastics and fibers, and in the synthesis of tetrahydrofuran (THF), polytetramethylene ether glycol, polyether type High-performance elastomers and spandex elastic fibers, unsaturated polyester resins, polyester polyols, butylene glycol ether solvents. BDO can also be used to produce N-methylpyrrolidone, acetal, maleic anhydride, 1.3-butadiene, etc. BDO's downstream product γ-butyrolactone is the raw material for the production of 2-pyrrolidone and N-methylpyrrolidine, from which a series of high value-added products such as vinylpyrrolidone and polyvinylpyrrolidone are derived . In the field of polyurethane, besides being used for synthesi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C29/80
CPCC07C29/80C07C31/207
Inventor 陈剑华
Owner 三惠(福建)工贸有限公司