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Method for the distillation of product mixtures

A product mixture and product technology, applied in the field of purification 1, can solve the problems of incomplete separation of by-products and impurities, high investment and operating costs, and damage to economy, so as to shorten downtime, reduce investment costs, and reduce operating costs Effect

Inactive Publication Date: 2009-11-04
VINNOLIT GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purification method described above is actually widely promoted, but has the following disadvantages: the purification has to be carried out in three distillation columns (40, 41, 42), thus involving high investment and operating costs
Furthermore, the high costs are also caused by a considerable consumption of the cleaning process, not least because the continuous process has to be interrupted to maintain and clean the different columns (40, 41, 42), which leads to additional downtimes of the plant
In addition, the chlorination of benzene carried out in a fixed bed reactor with catalyst is necessary for this distillation process, which requires additional investment and operating costs
All these disadvantages impair the economics of the method
[0007] In addition, this method has significant disadvantages, so that by-products and impurities with boiling points close to EDC cannot be completely separated, such as benzene and 1,1-dichloroethane from recycled EDC and / or low-boiling impurities from DC-EDC (such as ethylene and hydrogen chloride), so that the resulting EDC meets the usual international standards for the content of high boiling compounds and low boiling compounds in the EDC (marketable EDC) determined for sale (see Table 1)

Method used

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  • Method for the distillation of product mixtures
  • Method for the distillation of product mixtures
  • Method for the distillation of product mixtures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] according to figure 1 The flow chart shown, purify OC-EDC and recycle EDC in the following way:

[0068] OC-EDC (see Table 2 for purity) is introduced via column feed line 1 into a region of dividing wall distillation column 3 having trays 10 , a bottom part 11 , a top part 12 and a separating wall 13 . The recycled EDC (see Table 3 for purity) is introduced via column feed line 2 into the same region of dividing wall distillation column 3 . At the top part 12 of the dividing wall distillation column 3 , the low boilers and the water contained in the OC-EDC are separated off via the outlet line 6 . Pure EDC of marketable EDC quality (see Table 4) is separated via product outlet line 4 as a side discharge stream from another region of the dividing wall distillation column 3, to which OC-EDC 1 and recycle EDC 2 are not introduced. area and pumped, for example, into a storage tank not shown in the figure. In order to concentrate the high boilers present, the product fr...

Embodiment 2

[0110] according to figure 2 The flow chart shown, purify OC-EDC and recycle EDC in the following way:

[0111] OC-EDC (see table 5 for purity) is introduced via column feed line 1 into a region of dividing wall distillation column 3 having trays 10 , a bottom part 11 , a top part 12 and a separating wall 13 . The recycled EDC (see Table 6 for purity) is introduced into the EDC stripper through the input pipe 20 to separate HCl. HCl is separated off via outlet line 22 in the form of an overhead stream of the EDC stripper 21 and returned, for example, to the oxychlorination reaction for HCl neutralization. The bottom stream of the EDC stripping column 21 is conducted via a column feed line 23 into another region of the dividing wall distillation column 3 into which the OC-EDC 1 is not introduced, but into the lower half of the region. The salable EDC (see Table 7 for purity) is separated off as a side discharge stream from this region of the column via an outlet line 4 arran...

Embodiment 3

[0153] according to image 3 The flow chart shown, purify OC-EDC and recycle EDC in the following way:

[0154] OC-EDC (see Table 2 for purity) is introduced via column feed line 1 into a region of dividing wall distillation column 3 having trays 10 , a bottom part 11 , a top part 12 and a separating wall 13 . The recycled EDC (see Table 3 for purity) is introduced via column feed line 2 into the same region of dividing wall distillation column 3 . At the top part 12 of the separating wall distillation column 3 , a portion of the EDC / low boiler vapor is separated off via the discharge line 30 and introduced into the low boiler column 31 located above it. In this low boiler column 31 , which works as a reinforced column, the low boilers are concentrated. The low boilers and / or water are separated off from the low boilers column 31 via the discharge line 32 . Pure EDC of marketable EDC quality (see Table 4) is separated via product outlet line 4 as a side discharge stream fro...

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PUM

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Abstract

The present invention relates to a method for separating product mixtures, in particular using a distillation column, wherein the method preferably used for the purification of 1,2-dichloroethane (EDC) can be used. Impurities and / or by-products (high boilers and low boilers) can thus be separated almost quantitatively and simultaneously in only one distillation column.

Description

technical field [0001] The present invention relates to a method for separating product mixtures, especially when a distillation column is used, wherein the method can preferably be used for the purification of 1,2-dichloroethane (EDC). Background technique [0002] 1,2-Dichloroethane (ethylene dichloride, EDC) is produced industrially on a large scale according to two different processes as a pre-product for the manufacture of vinyl chloride (VC). One method is the so-called direct chlorination (DC), in which ethylene and chlorine are converted to EDC in the liquid phase by means of a homogeneous catalyst system. Another method is the so-called oxychlorination (OC), in which ethylene, hydrogen chloride and oxygen are converted to EDC in the gas phase by means of a heterogeneous catalyst system. The crude EDC produced according to these two methods (DC-EDC and / or OC-EDC) must be purified by distillation and then processed into VC by thermal decomposition (EDC decomposition,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D3/14C07C21/073C07C7/00B01D3/42F25J3/02C07C17/02C07C17/156C07C17/383
CPCC07C17/156C07C17/02B01D3/146B01D3/141C07C17/383C07C19/045
Inventor 彼得·卡默霍费尔
Owner VINNOLIT GMBH & CO KG