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Hexane recovery heat exchange method

A thermal method and hexane technology, applied in the field of hexane recovery and heat exchange, can solve the problems of large consumption of low-pressure steam and circulating cooling water, unreasonable energy utilization, low plate efficiency, etc., achieve uniform liquid phase flow, and reduce construction investment. , the effect of improving the efficiency of the board

Active Publication Date: 2016-03-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the prior art has the problems of large consumption of low-pressure steam and circulating cooling water, unreasonable energy utilization, high construction investment, and low plate efficiency. A new heat exchange method for hexane recovery is provided

Method used

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  • Hexane recovery heat exchange method

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Experimental program
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Effect test

Embodiment 1

[0016] use figure 1 As shown in the process, the production scale of HDPE is 200,000 tons / year. The water-containing subcooled liquid phase hexane stream 3 enters the hexane liquid phase heat exchanger 1, and after heat exchange, a heated stream 4 is obtained. The stream 4 enters the upper part of the hexane dehydration tower 2, and after separation, the hexane stream 5 containing water is obtained at the top of the tower, and the hexane stream 6 in the hot liquid phase without water is obtained at the bottom of the tower. The stream 6 enters the hexane liquid phase heat exchanger 1, and after exchanging heat with the supercooled liquid phase stream 3, a stream 7 is obtained; the cooled liquid phase hexane stream 7 enters the subsequent process. Wherein, the temperature of hexane stream 3 is 35°C, the temperature of stream 4 is 75°C, the temperature of stream 6 is 90°C, and the temperature of stream 7 is 60°C. The operating temperature of the hexane liquid phase heat exchang...

Embodiment 2

[0019] Same as [Example 1], the production scale of HDPE is 200,000 tons / year, but the operating conditions are changed. The temperature of hexane stream 3 was 45°C, that of stream 4 was 80°C, that of stream 6 was 99°C, and that of stream 7 was 72°C. The operating temperature of the hexane liquid phase heat exchanger 1 is 72° C., and the operating pressure is 0.17 MPaG. The operating temperature of the hexane dehydration tower 2 is 97° C., and the operating pressure is 0.14 MPaG. The operating temperature of the condenser 8 is 64° C., and the operating pressure is 0.37 MPaG.

[0020] By adopting the method of the invention, the consumption of low-pressure steam is reduced by 1.07 tons / hour, the consumption of circulating cooling water is reduced by 135 tons / hour, and the heat exchange area of ​​the reboiler of the hexane dehydration tower is reduced by 32 square meters, thereby reducing construction investment by 11.2%.

Embodiment 3

[0022] Same as [Example 1], the operating conditions are unchanged, but the production scale of HDPE is changed to 300,000 tons / year.

[0023] By adopting the method of the present invention, the consumption of low-pressure steam is reduced by 1.64 tons / hour, the consumption of circulating cooling water is reduced by 207 tons / hour, the heat exchange area of ​​the condenser 3 is reduced by 50 square meters, and the construction investment is reduced by 13.6%.

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Abstract

The invention relates to a heat exchange method for recycling hexane, mainly solving the problems of high consumption of low-pressure steam and circulating cooling water, unreasonable energy utilization, high equipment construction investment and low plate efficiency in the prior art. The heat exchange method for recycling hexane comprises the following steps that a) water containing undercooling liquid phase hexane material flow 3 enters a hexane liquid phase heat exchanger 1, and after heat exchange, a material flow 4 is obtained, wherein the temperature of the undercooling liquid phase hexane material flow 3 is 30-50 DEG C and the temperature of the material flow 4 is 65-85 DEG C; b) the material flow 4 enters the upper part of a hexane dehydrating tower 2, and after the material flow is separated, a material flow 5 is obtained at the top of the tower and a material flow 6 is obtained at the bottom of the tower; and c) the material flow 6 enters a hexane liquid phase heat exchanger 1 and exchanges heat with the material flow 3 so as to obtain a material flow 7, and the material flow 7 enters in the following processes, wherein the temperature of the material flow 6 is 85-105 DEG C, and the temperature of the material flow 7 is 50-70 DEG C. The problems in the prior art are well solved by the technical scheme, and the heat exchange method can be used for recycling hexane in the industrial production of high-density polyethylene.

Description

technical field [0001] The invention relates to a hexane recovery heat exchange method. Background technique [0002] High-density polyethylene (HDPE) is a highly crystalline, non-polar thermoplastic resin with a wide range of uses. Document CN200910090649.6 discloses a method for preparing ultrafine polyethylene powder, and document CN200910156643.4 discloses a double series reactor process for preparing polyethylene. In the production of high-density polyethylene in the prior art, in the hexane recovery unit, the feed to the hexane dehydration tower is a supercooled liquid phase, and the reboiler of the tower needs to be heated with low-pressure steam, resulting in an increase in the heat load of the hexane dehydration tower. However, the hot liquid phase discharge of the hexane dehydration tower needs to be cooled by circulating cooling water, and then sent to the storage tank for storage. Therefore, there are problems such as large consumption of low-pressure steam and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/02C08F2/00C07C9/15C07C7/00
CPCY02P20/10Y02P20/50
Inventor 沙裕张斌徐德勤吕世军崔春霞高毕亚匡顺强何琨
Owner CHINA PETROLEUM & CHEM CORP
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