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Cleaning method of esterifying polycondensation step for polyester preparing equipment and pipeline

An equipment and esterification technology, applied in chemical instruments and methods, cleaning methods using liquids, cleaning methods and utensils, etc., can solve the problems of prolonged driving time, large recycling workload, high heat load, and achieve high safety, Good cleaning effect and low heat load effect

Inactive Publication Date: 2005-06-01
济南齐鲁化纤集团有限责任公司
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  • Summary
  • 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 and pipeline
  • Cleaning method of esterifying polycondensation step for polyester preparing equipment and pipeline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] The names of equipment and chemical substances are:

[0011] R-21 The first esterification tank R-22 The second esterification tank

[0012] R-31 The first polycondensation tank R-32 The second polycondensation tank

[0013] R-33 The third polycondensation tank T-21 The first rectification tower

[0014] T-22 Second Distillation Column F-22 Melt Filter

[0015] F-33 ​​Melt Filter GP-22 Melt Transfer Pump

[0016] GP-33-1 Melt Transfer Pump EG Glycol

[0017] KOH potassium hydroxide TEG triethylene glycol

[0018] 1. Use 1.0% KOH-EG solution for the first cleaning:

[0019] 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.

[0020] 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

The invention provides a method for cleaning the esterification polycondensation equipment and the pipeline system of the ester plant after parking. The esterification polycondensation production process of the ester unit is added to the equipment and pipeline system, the temperature of the cleaning liquid is controlled at 200-230°C, the residue after the alcoholysis and discharge is stirred, and then the equipment and pipeline system are led out to the recycling process, and finally the equipment and pipeline The temperature of the system is lowered to below 100°C, and then water is added for washing. The weight ratio of the potassium hydroxide to ethylene glycol is 1:90-110.

Description

technical field [0001] The invention relates to a method for cleaning esterification polycondensation equipment and pipelines of a polyester plant after shutdown. 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 invention [0003] The object of t...

Claims

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Application Information

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Patent Type & Authority Patents(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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