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Method for recovering latent heat in sec-butyl acetate preparation device and combined device

A technology for the preparation of sec-butyl acetate and equipment, which is applied to the preparation of carboxylic acid esters, chemical instruments and methods, and the preparation of organic compounds, and can solve the problem of high energy consumption

Active Publication Date: 2014-05-14
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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  • Method for recovering latent heat in sec-butyl acetate preparation device and combined device
  • Method for recovering latent heat in sec-butyl acetate preparation device and combined device
  • Method for recovering latent heat in sec-butyl acetate preparation device and combined device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] 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

[0113] This embodiment adopts the same condensation evaporator as that of Embodiment 1.

[0114] 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

[0118] This embodiment adopts the same condensation evaporator as that of Embodiment 1.

[0119] 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 method for recovering latent heat in a sec-butyl acetate preparation device by using C4 raw material separation device. The method comprises the following steps of: introducing a tower top gas-phase material of an azeotropic rectification tower and / or a refining tower into shell-and-tube heat exchange equipment, wherein a tube pass of a vertical counter-flow condensation evaporator with a thinner cylinder lower section and a thicker cylinder upper section is preferably selected; introducing a liquid-phase material at a tower bottom or a tower bottom side line of a butene concentration tower of the C4 raw material separation device into a shell pass of the tube-and-shell heat exchange equipment; after heat exchange, condensing the tower top gas-phase material of the azeotropic rectification tower and / or the refining tower into a liquid-phase material to be fed into a tower top reflux accumulator; and gasifying the tower bottom liquid-phase material of the butene concentration tower into the gas-phase material to be circulated into the butene concentration tower. According to the method, the tower top gas-phase material of the azeotropic rectification tower of the sec-butyl acetate device and the tower bottom liquid-phase material of the butene concentration tower of the C4 raw material separation device are subjected to heat exchange, and the two streams of materials are subjected to phase shift in the shell-and-tube heat exchange equipment, so that the latent heat is fully utilized, the steam consumption of the C4 raw material separation device and the consumption of tower top circulating water of the refining tower are reduced, the energy consumption is greatly reduced, and the cost is saved.

Description

technical field [0001] The invention relates to a method for recovering latent heat in a sec-butyl acetate preparation device by using a C4 raw material separation process or device, and a combined device used in the method. 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 , has gradually attracted 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 e...

Claims

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Application Information

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