Method for recycling crude product triethylamine in AKD (alkyl ketene dimer) production

A technology of triethylamine and crude products, which is applied in the field of solvent recycling treatment, can solve the problems that the recovery rate affects product cost and market competitiveness, the high price of triethylamine solvent, and the high investment cost of membrane separation, so as to achieve high production efficiency, High recovery rate and reduced steam consumption

Inactive Publication Date: 2015-04-01
甘肃银光聚银化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The price of triethylamine solvent is relatively high, and the recovery rate of triethylamine directly affects the cost of the product and the competitiveness of the market
It is well known that the investment cost of membrane separation is relatively high. At the same time, the maintenance of membrane modules is difficult, and the cost of membrane replacement is also high. These problems limit its wide application.

Method used

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  • Method for recycling crude product triethylamine in AKD (alkyl ketene dimer) production
  • Method for recycling crude product triethylamine in AKD (alkyl ketene dimer) production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The first step: the mixture of the crude product triethylamine of 550kg / h generated and the brine of 1210kg / h is pressurized by a pump and then introduced into the fiber coalescer (1), and the pressure difference between the front and back ports of the fiber coalescer equipment is 0.30MPa, The light phase liquid can obtain 585.1kg / h (heavy component mass content 3.5%, water mass content 2.4%) crude triethylamine. Send to evaporator (4) with delivery pump (2) metering;

[0031] Second step: the crude product triethylamine enters from the top of the evaporator (4), and the temperature of the evaporator (4) is 120°C. Include the following steps:

[0032] (I) The preheater pressure is 0.50MPa;

[0033] (II) The outlet flow rate at the bottom of the evaporator (4) is 40.6kg / h;

[0034] (Ⅲ) The outlet flow rate at the bottom of the reevaporator (5) is 20.2kg / h;

[0035](IV) The gas phase outlet pressure of the evaporator (4) and re-evaporator (5) is 0.04 MPa.

[0036] Th...

Embodiment 2

[0043] The first step: the mixture of the crude product triethylamine of 1700kg / h generated and the brine of 2215kg / h is pressurized by a pump and introduced into the fiber coalescer (1), and the pressure difference between the front and rear ports of the fiber coalescer equipment is 0.50MPa, The light phase liquid can obtain 1813.3kg / h (heavy component mass content 4.1%, water mass content 1.9%) crude triethylamine. Send to evaporator (4) with delivery pump (2) metering;

[0044] Second step: the crude product triethylamine enters from the top of the evaporator (4), and the temperature of the evaporator (4) is 120°C. Include the following steps:

[0045] (I) The preheater pressure is 0.70MPa;

[0046] (II) The outlet flow rate at the bottom of the evaporator (4) is 83.5kg / h;

[0047] (Ⅲ) The outlet flow rate at the bottom of the reevaporator (5) is 79.3kg / h;

[0048] (IV) The gas phase outlet pressure of the evaporator (4) and re-evaporator (5) is 0.03 MPa.

[0049] The ...

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Abstract

The invention relates to a method for recycling a crude product triethylamine in AKD (alkyl ketene dimer) production. The method comprises steps as follows: a, the crude product triethylamine is subjected to crude separation by a decanter; b, the crude product triethylamine enters the top of an evaporator after preheated by a preheater, heavy components enter a revaporizer, residual triethylamine is continuously evaporated in the revaporizer, and the heavy components are discharged from a tower bottom; c, light components continuously enters a rectifying tower after evaporation, and trace moisture in triethylamine is removed according to the azeotropic distillation principle; and d, trace solid particles in the crude product triethylamine evaporation process are removed by a filter arranged at the tower bottom. The crude product triethylamine in the AKD production process is treated and reused in AKD production, waste water and waste residue emission pollution is avoided, gas-phase feeding is adopted, steam consumption is reduced, further, triethylamine recycling rate is high, the production cost of an AKD product is reduced, and more remarkable economic benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of solvent recycling treatment, and in particular relates to a method and a device for recycling crude triethylamine in the production process of AKD. Background technique [0002] AKD is the English abbreviation of Alkyl Ketene Dimer (Alkyl Ketene Dimmer). It is an excellent neutral sizing agent for paper. Compared with traditional sizing agents, it can improve paper quality, reduce production costs, and reduce environmental pollution. etc. It has good performance, and has been widely used in the paper industry at home and abroad, and has broad market prospects. Triethylamine is widely used as quaternary ammonium salt, medicine, pesticide, dye and other organic solvents in various chemical fields. In AKD synthesis, triethylamine is used as an acid-binding agent for recycling, and the AKD synthesis reaction equation is as follows: [0003] [0004] After the reaction, triethylamine hydrochloride is gene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C211/05C07C209/86C07D305/12
Inventor 李小利韩胜兵沈精平蒙鸿飞李晓明毛志红张峰何玉姣
Owner 甘肃银光聚银化工有限公司
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