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Heat exchange method in hexane recycling process
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A thermal method and hexane technology, applied in the field of heat exchange in the hexane recovery process, can solve the problems of high construction investment and high energy consumption, and achieve the effects of reducing heat exchange area, improving technical effects and reducing construction investment.
Active Publication Date: 2015-02-11
CHINA PETROLEUM & CHEM CORP +1
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[0003] The technical problem to be solved by the present invention is that there are problems of high energy consumption and high construction investment in the prior art, and a new heat exchange method in the recovery process of hexane is provided
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Embodiment 1
[0017] use figure 1 As shown in the process, the production scale of HDPE is 200,000 tons / year. The hexane stream 5 enters the hexane stripping tower 1, and after separation, the oligomer 6 is obtained at the bottom of the tower, and the gas phase stream 7 is obtained at the top of the tower. Stream 7 directly enters hexane heat exchanger 2 to obtain stream 8 after heat exchange. Stream 8 enters condenser 3 and is condensed to the bubble point (91°C) to obtain stream 9. Stream 9 enters the upper part of hexane dehydration tower 4, and after separation, stream 10 is obtained at the top of the tower, and stream 11 of hexane is obtained at the bottom of the tower; stream 11 is divided into stream 12 and stream 13. The stream 12 directly enters the hexane heat exchanger 2, and exchanges heat with the stream 7 to obtain the stream 14; the stream 14 is returned to the bottom of the hexane dehydration tower 4.
[0018] Among them, the temperature of stream 7 is 116.5°C, the temper...
Embodiment 2
[0022] Same as [Example 1], the production scale of HDPE is 200,000 tons / year, but the operating conditions are changed. The temperature of stream 7 was 123.5°C, the temperature of stream 8 was 119.5°C, the temperature of stream 12 was 97.5°C, and the temperature of stream 14 was 100°C. The weight ratio of stream 12 to stream 13 was 4:1. The operating temperature of the hexane stripping tower 1 is 135° C., and the operating pressure is 0.35 MPaG. The operating temperature of the hexane dehydration tower 4 is 102.5° C., and the operating pressure is 0.13 MPaG. The operating temperature of the hexane heat exchanger 2 is 117.5° C., and the operating pressure is 0.24 MPaG. The operating temperature of the condenser 3 is 85° C., and the operating pressure is 0.2 MPaG.
[0023] By adopting the method of the present invention, the consumption of low-pressure steam is reduced by 7.58 tons / hour, the consumption of circulating cooling water is reduced by 961 tons / hour, the heat excha...
Embodiment 3
[0025] Same as [Example 1], the operating conditions are unchanged, but the production scale of HDPE is changed to 300,000 tons / year.
[0026] By adopting the method of the present invention, the consumption of low-pressure steam is reduced by 11.60 tons / hour, the consumption of circulating cooling water is reduced by 1470 tons / hour, the heat exchange area of the condenser 3 is reduced by 639 square meters, and the construction investment is reduced by 46.1%.
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Abstract
The invention relates to a heat exchange method in hexane recycling process, mainly solving the problems of high energy consumption and high construction investment in the prior art. The heat exchange method comprises the following steps that a) hexane material flow 5 enters a hexane stripping tower 1, and after the hexane material flow is separated, an oligomer 6 is obtained at the bottom of the tower and a gas phase material flow 7 is obtained at the top of the tower; b) the material flow 7 directly enters a hexane heat exchanger 2, and after heat exchanging, a material flow 8 is obtained; c) the material flow 8 enters a condenser 3, after the material flow 8 is cooled to 90-95 DEG C and condensed, a material flow 9 is obtained; d) the material flow 9 enters the upper part of a hexane dehydrating tower 4, and after the material flow 9 is separated, a material flow 10 is obtained at the top of the tower and a hexane material flow 11 is obtained at the bottom of the tower, wherein the material flow 11 is divided into a material flow 12 and a material flow 13; and e) the material flow 12 enters the hexane heat exchanger 2 directly so as to change heat with the material flow 7 to obtain a material flow 14, and the material flow 14 returns back to the tower kettle of the hexane dehydrating tower 4. The problems in the prior 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 heat exchange method in the recovery process of hexane. 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 CN 200910156643.4 discloses a double-tandem reactor process for preparing polyethylene. When producing high-density polyethylene in the prior art, the hexane recovery unit includes a hexane stripper and a hexane dehydration tower, the gas phase material at the top outlet of the hexane stripper is condensed with circulating cooling water, and the hexane dehydration tower is reboiled The device is heated by low-pressure steam, thereby realizing the purpose of separating hexane from other materials. However, with this process route, there is a problem of energy waste due to the repeated cooling and heating of the hexane materia...
Claims
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