Cleaning method of esterifying polycondensation step for polyester preparing equipment

A technology of esterification and polycondensation, which is applied in the cleaning field of the esterification and polycondensation process of polyester plants, can solve the problems of high heat load, prolonged start-up time, and poor safety, and achieve low heat load, good cleaning effect, and high safety. Effect

Inactive Publication Date: 2002-07-24
济南齐鲁化纤集团有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The operating temperature of this cleaning method is usually 270°C, high temperature, poor safety, high heat load, long cleaning time, prolonging the start-up time, and the cleaning solution of triethylene glycol and ethylene glycol must be recovered twice, and the recovery workload big, expensive

Method used

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  • Cleaning method of esterifying polycondensation step for polyester preparing equipment

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Experimental program
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Effect test

Embodiment Construction

[0008] The names of equipment and chemical substances are:

[0009] R-21 The first esterification tank R-22 The second esterification tank

[0010] R-31 The first polycondensation tank R-32 The second polycondensation tank

[0011] R-33 The third polycondensation tank T-21 The first rectification tower

[0012] T-22 Second Distillation Column F-22 Melt Filter

[0013] F-33 ​​Melt Filter GP-22 Melt Transfer Pump

[0014] GP-33-1 Melt Transfer Pump EG Glycol

[0015] KOH potassium hydroxide TEG triethylene glycol

[0016] 1. Use 1.0% KOH-EG solution for the first cleaning:

[0017] 1. Cool R-21 to 190°C, introduce 14 tons of EG, start the R-21 agitator to stir, add 140 kg of KOH, control the internal pressure of R-21 to 0.14MPa, gradually increase the temperature to 220°C, and keep the cleaning time for 3 hours. T-21 was cleaned with EG steam in R-21.

[0018] After 2.3 hours, R-21 cools down to 190°C, transfers 7.0 tons of cleaning liquid from R-21 to R-22, turns off the...

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Abstract

A cleaning method for the esterifying polycondensation step of polyester preparing equipment incldues adding the ethanediol solution of potassium hydroxide to system, controlling temp at 200-230 deg.C, stirring for alcoholysis, discharging the residual material and delivering it to recovery step, cooling the system to 100 deg.C and adding water for water washing.

Description

technical field [0001] The invention relates to a cleaning method for cleaning equipment and pipelines after the esterification and polycondensation process of a polyester plant is shut down. Background technique [0002] The direct esterification and continuous polycondensation process of the Japanese bell spinning company currently in operation uses purified terephthalic acid and ethylene glycol as raw materials to produce fiber-grade polyethylene terephthalate chips and melts. When parking for maintenance, use triethylene glycol as the cleaning solution for the first pass, and use ethylene glycol as the cleaning solution for the second pass. The operating temperature of this cleaning method is usually 270°C, high temperature, poor safety, high heat load, long cleaning time, prolonging the start-up time, and the cleaning solution of triethylene glycol and ethylene glycol must be recovered twice, and the recovery workload Larger and more expensive. Contents of the invent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B08B3/08C08G63/85
Inventor 鞠培勇张纪光张志伟张赞琴虞胜福赵卫东
Owner 济南齐鲁化纤集团有限责任公司
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