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
CN1203927CInactive Publication Date: 2005-06-01济南齐鲁化纤集团有限责任公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
济南齐鲁化纤集团有限责任公司
Publication Date
2005-06-01
Estimated Expiration
Not applicable · inactive patent

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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