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Condensing evaporator and application

A condensing evaporator and shell-side technology, applied in the field of condensing evaporators, can solve the problem of high energy consumption

Inactive Publication Date: 2013-01-30
HUNAN ZHONGCHUANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to overcome the technical defect of high energy consumption of the existing sec-butyl acetate plant containing the raw material pretreatment unit, and provide a method for effectively recycling the latent heat of the two sets of devices and reducing energy consumption

Method used

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  • Condensing evaporator and application
  • Condensing evaporator and application
  • Condensing evaporator and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] Adopt the mixed C4 after ether as raw material, wherein, in this raw material, the content of isobutane is 47.10%, the content of n-butane is 18.24%, the content of isobutene is 0.12%, the content of n-butene is 34.4%, the content of C5 The content is 0.14%, and the material flow rate is 28t / h ether and the mixed C4 (2) is passed into the butene concentration tower (1). The butene concentration tower (1) is a valve tower with 178 trays. Control the reflux ratio of the butene concentration tower (1) to be 12, the temperature at the top of the tower is 48.1°C, the gauge pressure at the bottom of the tower is 0.64MPa, the temperature at the bottom of the tower is 64.5°C, and the material flow rate is 12.6t / h of isobutane (5 ) from the top of the butene concentration tower (1), and a part of the liquid phase material (4) at the bottom of the butene concentration tower (1) is passed into the extractive distillation tower at a rate of 15.4t / h to continue the extraction Concen...

Embodiment 2

[0115] This embodiment adopts the same condensation evaporator as that of Embodiment 1.

[0116] Using ether mixed C4 as raw material, wherein the content of isobutane is 22.1%, the content of n-butane is 11.5%, the content of isobutene is 0.8%, the content of n-butene is 64.4%, and the content of C5 is 1.2%. , the material flow rate is 35t / h ether and the mixed C4 (2) is passed into the butene concentration tower (1). The butene concentration tower (1) is a valve tower with 205 plates and a 1 reboiler, the steam flow rate of the reboiler is controlled to be 5t / h, the reflux ratio of the butene concentration tower (1) is 15, the temperature at the top of the tower is 42.5°C, the gauge pressure at the bottom of the tower is 0.54MPa, and the temperature at the bottom of the tower is The isobutane (5) with a material flow rate of 7.6t / h at 57.5°C is distilled from the top of the butene concentration tower (1), and a part of the liquid phase material at the bottom of the butene co...

Embodiment 3

[0120] This embodiment adopts the same condensation evaporator as that of Embodiment 1.

[0121] Using ether after mixing C4 as raw material, the content of isobutane is 37.6%, the content of n-butane is 13.1%, the content of isobutene is 0.4%, the content of n-butene is 48.4%, and the content of C5 is 0.5%. , the material flow rate is 40t / h ether and the mixed C4 (2) is passed into the butene concentration tower (1). The butene concentration tower (1) is a valve tower with 230 trays and a 2 reboilers, the total steam flow rate of the reboilers is controlled to be 8t / h, the reflux ratio of the butene concentration tower is 18, the temperature at the top of the tower is 54.5°C, the gauge pressure at the bottom of the tower is 0.75MPa, and the temperature at the bottom of the tower is 69.5 °C, the isobutane (5) with a material flow rate of 14.6t / h is distilled from the top of the butene concentration tower (1), and a part of the bottom liquid phase material (4) of the butene con...

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Abstract

The invention relates to a condensing evaporator used in a method for recovering latent heat in a sec-butyl acetate preparation device by using a C4 raw material separation device. According to the method, gas-phase materials on the top of an azeotropic distillation tower and / or a refining tower are introduced into a tube pass of the condensing evaporator (preferably a vertical counter-flow condensing evaporator of which a cylinder body has a relatively thin lower section and a relatively thick upper section); liquid-phase materials at the bottom or on side lines of the lower part of a butylene concentration tower of the C4 raw material separation device are introduced into a shell pass of the condensing evaporator; the gas-phase materials on the top of the azeotropic distillation tower and / or the refining tower are condensed into liquid-phase materials after being subjected to heat exchange, and the liquid-phase materials enter a return tank on the top of the tower; and the liquid-phase materials at the bottom of the butylene concentration tower are gasified into gas-phase materials, and the gas-phase materials return to the butylene concentration tower in a recycling mode. By the method, the gas-phase materials on the top of the azeotropic distillation tower of the sec-butyl acetate preparation device exchange heat with the liquid-phase materials at the bottom of the butylene concentration tower of the C4 raw material separation device, and the two kinds of materials are subjected to phase change in the condensing evaporator, so that the latent heat is fully utilized, consumption of steam in the C4 raw material separation device and consumption of recycling water on the top of the azeotropic distillation tower and the refining tower are reduced, energy consumption is greatly reduced, and the cost is saved.

Description

technical field [0001] The invention relates to a condensing evaporator used in a method for recovering latent heat in a sec-butyl acetate preparation device by using a C4 raw material separation device. Background technique [0002] Second-butyl acetate is a new type of solvent, which has the characteristics of low toxicity, environmental protection and strong solubility. It can be used as spices, solvents, drug absorption accelerators, reaction medium components, extractant components, metal cleaning agents, etc., and has a wide range of uses , gradually attracting more and more attention. At present, domestic sec-butyl acetate is mainly produced by one-step synthesis of olefin addition, that is, using acetic acid and n-butene in refinery mixed C4 as raw material. Compared with the traditional process of alcohol esterification, the synthetic method of acetic acid and n-butene has the characteristics of wide source of raw materials, low cost, good economic benefit and envi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28D7/00C07C69/14C07C67/04C07C11/08C07C7/00
CPCY02P20/10Y02P20/50
Inventor 胡先念李华
Owner HUNAN ZHONGCHUANG CHEM
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