Enhanced process for the purification of anhydrous hydrogen chloride gas

a technology of anhydrous hydrogen chloride and purification process, which is applied in the direction of chemistry apparatus and processes, liquefaction, light and heating apparatus, etc., can solve the problems of high energy and expensive equipment, inability to dispose of, and contaminant levels that are sometimes unacceptable for use in vinyl chloride production

Inactive Publication Date: 2007-11-15
BAYER MATERIALSCIENCE AG +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because large amounts of aHCl can not be disposed of, one of the challenges encountered with each of these processes is purification of the aHCl generated to obtain a usable technical product or raw material for other processes.
The processes disclosed in these patents require high amounts of energy and expensive equipment.
The process disclosed in the '957 patent results in contaminant levels occasionally unacceptable for use in vinyl chloride production.
The contaminant level achieved is always unacceptable for use in Deacon processes.
However, the volume of HCl byproduct produced often exceeds the market demand.
This process is very sensitive to traces of some contaminants, such as sulfur and some organic compounds, which over time can lead to catalyst deactivation and / or plugging of reactors, which in turn can lead to unwanted by-product formation.
), which limits the usefulness of this approach.

Method used

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  • Enhanced process for the purification of anhydrous hydrogen chloride gas
  • Enhanced process for the purification of anhydrous hydrogen chloride gas
  • Enhanced process for the purification of anhydrous hydrogen chloride gas

Examples

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Embodiment Construction

[0012] The present invention is broadly directed to a cooling and distillation process to remove contaminants having boiling points higher than hydrogen chloride from a hydrogen chloride-containing gas comprising: [0013] a) compressing said hydrogen chloride-containing gas, [0014] b) cooling the resultant compressed gas in a first heat exchanger resulting in a first condensate stream and a first gas stream, wherein said compressed gas is cooled to a temperature low enough to partially condense said contaminants and at a rate sufficiently low that fog formation is prevented, [0015] c) feeding said first gas stream from said first heat exchanger to a distillation column having a top portion and a bottom portion to a point between said top portion and said bottom portion, to cause mass transfer between liquid and gas and to thereby concentrate the contaminants in the bottom portion of said column and hydrogen chloride gas in the top portion of said column, [0016] d) feeding said hydrog...

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Abstract

The present invention relates to a process for purifying anhydrous hydrogen chloride gas (“aHCl”), and preferably the anhydrous hydrogen chloride gas recovered from an isocyanate production process. In the process of the present invention, the content of chlorinated organics may be reduced from up to 1000 ppm by volume to below 10 ppb by volume levels. Generally, the process of the invention allows for chlorinated organic levels to be reduced to from 1 to 100 ppb, rendering the treated hydrogen chloride gas usable in a catalytic oxychlorination process or a Deacon process. The treated gas is also suitable for absorption in water or dilute hydrochloric acid.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates to a process for purifying anhydrous hydrogen chloride gas (“aHCl”), and preferably the anhydrous hydrogen chloride gas recovered from an isocyanate production process. In the process of the present invention, the content of chlorinated organics may be reduced from up to 1000 ppm by volume to below 10 ppb by volume levels. Generally, the process of the invention allows for chlorinated organic levels to be reduced to from 1 to 100 ppb, rendering the treated hydrogen chloride gas usable in a catalytic oxychlorination process or a Deacon process. The treated gas is also suitable for absorption in water or dilute hydrochloric acid. [0002] A number of important chemical processes generate aHCl as a byproduct. Examples of such processes include chlorination processes, silane production processes and phosgenation processes. Because large amounts of aHCl can not be disposed of, one of the challenges encountered with each of th...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F25J3/00
CPCC01B7/0712C01B7/01C01B7/07
Inventor BOONSTRA, ERIC F.TEEPE, JOHN M.VANDEKAMP, RENAE M.HIELSCHER, ANKEHALLENBERGER, KASPAR
Owner BAYER MATERIALSCIENCE AG
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