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Heat exchange process in production of polyvinyl chloride

A heat exchange and polyvinyl chloride technology, which is applied in the field of heat exchange technology for polyvinyl chloride production, can solve problems such as cooling loss, and achieve the effects of easy molding, good overall strength and low price.

Active Publication Date: 2011-04-20
QINGDAO HAIWAN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the mixed gas at the outlet of the synthesis cooler has a large amount of cooling capacity, which cannot be reused and is lost in vain. PVC manufacturers seldom involve in the research on the utilization of cooling capacity in this aspect.

Method used

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  • Heat exchange process in production of polyvinyl chloride
  • Heat exchange process in production of polyvinyl chloride
  • Heat exchange process in production of polyvinyl chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The equipment used in this process is two tube-and-tube graphite heat exchangers. The shell side of the primary heat exchanger is mixed gas, and the tube side is vinyl chloride gas; the shell side of the secondary heat exchanger is mixed gas, and the tube side is acetylene gas; the heat transfer coefficient K of the graphite heat exchanger is 20kcal / (m 2h°C). The heat exchange area of ​​the required primary and secondary graphite heat exchangers is selected as 380m 2 , the circulation area is 0.36m 2 . Shell D=1.7m, the outer diameter of the tubes is 32mm, the inner diameter is 22mm, arranged in an equilateral triangle, the spacing between the tubes is 1.25 times the outer diameter of the tubes, a total of 950 pieces, the length of the tubes is 4 meters, and a circular baffle is used. The gaps are arranged up and down, the distance between the baffles is h=0.9m, and the shell is treated with PO lining for anticorrosion.

[0035] The inlet temperature of the mixed ga...

Embodiment 2

[0037] The equipment used in this process is two tube-and-tube graphite heat exchangers. The shell side of the primary heat exchanger is mixed gas, and the tube side is vinyl chloride gas; the shell side of the secondary heat exchanger is mixed gas, and the tube side is acetylene gas; the heat transfer coefficient K of the graphite heat exchanger is 20kcal / (m 2 h°C). The heat exchange area of ​​the required primary and secondary graphite heat exchangers is selected as 370m 2 , the circulation area is 0.34m 2 . Shell D=1.9m, the outer diameter of the tubes is 30mm, the inner diameter is 21mm, arranged in an equilateral triangle, the spacing between the tubes is 1.35 times the outer diameter of the tubes, a total of 900 pieces, the tube length is 4 meters, and a circular baffle is used. The gaps are arranged up and down, the distance between the baffles is h=0.9m, and the shell is treated with PO lining for anticorrosion.

[0038] The inlet temperature of the mixed gas prima...

Embodiment 3

[0040] The equipment used in this process is two tube-and-tube graphite heat exchangers. The shell side of the primary heat exchanger is mixed gas, and the tube side is vinyl chloride gas; the shell side of the secondary heat exchanger is mixed gas, and the tube side is acetylene gas; the heat transfer coefficient K of the graphite heat exchanger is 21kcal / (m 2 h°C). The heat exchange area of ​​the required primary and secondary graphite heat exchangers is selected as 360m 2 , the circulation area is 0.38m 2 . Shell D=1.8m, the outer diameter of the tubes is 34mm, the inner diameter is 23mm, arranged in an equilateral triangle, the spacing between the tubes is 1.40 times the outer diameter of the tubes, a total of 900 pieces, the length of the tubes is 4 meters, and a circular baffle is used. The gaps are arranged up and down, the distance between the baffles is h=0.8m, and the shell is treated with PO lining for anticorrosion.

[0041] The inlet temperature of the mixed g...

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Abstract

The invention relates to a heat exchange process in production of polyvinyl chloride. The heat exchange process comprises the following steps of: deacidifying mixed gas of ethyne and hydrogen chloride cooled by a chiller through an acid mist eliminator, and performing primary heat exchange with crude vinyl chloride from an alkaline tower; and performing secondary heat exchange between the mixed gas of the ethyne and the hydrogen chloride subjected to the primary heat exchange and acetylene gas from the ethyne. Before the heat exchange process is used, a front cooler is singly used for cooling, the temperature of the crude vinyl chloride is 12 to 15 DEG C; and after the project is used, the temperature of crude vinyl chloride at an outlet of a graphite cooler is 9 to 9.5 DEG C, and when the front cooler is slightly started or is not started, saline water with the temperature of 0 DEG C enters a monomer compressor, the temperature of the vinyl chloride is 6.5 to 8 DEG C, and the effects of cooling and dehydrating are obvious.

Description

technical field [0001] The invention relates to a polyvinyl chloride production process, in particular to a polyvinyl chloride production heat exchange process. Background technique [0002] Our country is a developing country with a large population and shortage of resources. The rapid economic development in recent years has also produced "by-products" such as excessive consumption of resources and serious environmental pollution. Therefore, vigorously developing circular economy and establishing a resource-saving and environment-friendly society are the inevitable choices for our country to achieve sustainable development strategy. The "Eleventh Five-Year Plan" puts forward the goals of energy saving, consumption reduction and pollution reduction, and serves as binding indicators, which is of great significance for promoting the change of economic growth mode and strengthening energy conservation and environmental protection. [0003] The production of polyvinyl chloride...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F114/06
Inventor 张英民郎需霞刘珍玉张清亮邓春雷刘立成
Owner QINGDAO HAIWAN CHEM CO LTD