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High yield co-production of anhydrous hydrogen bromide and sodium bisulfate

a technology of anhydrous hydrogen bromide and sodium bisulfate, which is applied in the direction of lithium compounds, sulfur compounds, alkali metal sulfites/sulfates, etc., can solve the problems of high boiling water/hbr azeotrope stream, hydrogen bromide, and limited commercial application of azeotropic solutions

Inactive Publication Date: 2006-05-18
SHELLEF HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a process for producing anhydrous hydrogen bromide and a purified bisulfate salt from bromide salt and sulfuric acid. The process involves adding sulfuric acid to a slurry of sodium bromide and reacting it with the bromide salt to produce crude aqueous hydrogen bromide and crude bisulfate salt. The crude bisulfate salt is then purified to remove bromides and form a purified bisulfate salt. The purified hydrogen bromide is produced by distillation and has low water content. The purified bisulfate salt has low bromine content. The technical effects of the patent text include reducing excessive bromine formation, facilitating handling of the solids, and producing high-concentration hydrogen bromide and purified bisulfate salt.

Problems solved by technology

One drawback of known production methods for producing anhydrous hydrogen bromide is that a high boiling water / HBr azeotrope stream is produced.
This azeotropic solution has only limited commercial application due to the presence of the water.
This process will have high costs for two reasons.
First, the process must be carried out in equipment design to withstand the high pressures and corrosive environment.
Second, energy costs are high due to the high reflux ratios required to affect the distillation process as well as the high heats of evaporation of aqueous systems.

Method used

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  • High yield co-production of anhydrous hydrogen bromide and sodium bisulfate
  • High yield co-production of anhydrous hydrogen bromide and sodium bisulfate
  • High yield co-production of anhydrous hydrogen bromide and sodium bisulfate

Examples

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Effect test

example 1

[0039] Aqueous slurry with NaBr and water: A slurry of 258 gm sodium bromide and 58 gm water was prepared and added to a 500 ml round bottom flask. To this was added 238 gm of concentrated sulfuric acid over a period of 1.5 hours at a temperature of approximately 120° C. Upon addition of 15% of the sulfuric acid hydrogen bromide gas began to off gas and was collected in a water trap. The reaction bottoms were then heated 145° C. once all the sulfuric acid was added to drive off additional HBr.

[0040] The reaction effluents were as follows: [0041] 205 gm of HBr was collected and consisted of 90% HBr and 10% water. [0042] 334.3 gm of sodium bisulfate was collected and contained 4.0% Br-

example 2

[0043] An aqueous slurry of NaBr in 48% HBr: A slurry of 600 gm sodium bromide and 110 gm of 48% aqueous hydrogen bromide was prepared and added to a 1000 ml round bottom flask. To this was added 637 gm of concentrated sulfuric acid over a period of 1.5 hours. The initial temperature at the beginning of the acid addition was 70° C. and was ramped up to 140° C. at the end of the acid addition. Hydrogen bromide was generated immediately upon the addition of sulfuric acid and was collected in a water trap.

[0044] The reaction effluents were as follows: [0045] 526 gm of HBr was collected and consisted of 90% HBr and 10% water. [0046] 820 gm of sodium bisulfate was collected and contained 3.9% Br-.

example 3

[0047] An aqueous mixture ofNaBr and NaHS04-H2O: A slurry of 600 gm sodium bromide with 62 gm of 48% aqueous hydrogen bromide 59 gm NaHSO4 and 8 gm water was prepared and added to a 1000 ml round bottom flask. To this was added 638 gm of concentrated sulfuric acid over a period of 45 minutes. The temperature was held at 120° C. Hydrogen bromide was generated almost immediately upon the addition of sulfuric acid and was collected in a water trap.

[0048] The reaction effluents were as follows: [0049] 487 gm of HBr was collected and consisted of 98% HBr and 2% water. [0050] 887 gm of sodium bisulfate was collected.

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Abstract

A batch process for co-producing anhydrous hydrogen bromide and a purified bisulfate salt comprising: (a) charging a batch reactor with a bromide salt slurry, wherein the slurry is more than 50% by weight bromide salt; (b) reacting the slurry with sulfuric acid in a batch reaction wherein bromide salt is consumed to produce crude aqueous hydrogen bromide and crude bisulfate salt, the crude bisulfate salt containing bromine; (c) prior to or concurrently with step (b) adding hydrogen bromide to the reactor; (d) purifying the crude hydrogen bromide to produce anhydrous hydrogen bromide; and (e) removing bromine from the crude bisulfate salt to form a purified bisulfate salt.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This non-provisional patent application is based upon U.S. Provisional Patent Application No. 60 / 628,813, filed Nov. 17, 2004, entitled “Method For The Co-Production of Hydrogen Bromide and Low Bromide Sodium Bisulfate from Bromide Salts and Sulfuric Acid”, the priority of which is hereby claimed.FIELD OF THE INVENTION [0002] The present invention is directed generally to the co-production of anhydrous hydrogen bromide and low bromide sodium bisulfate. More specifically, there is provided in accordance with the present invention a method of producing anhydrous hydrogen bromide and purified sodium bisulfate from a sodium bromide slurry and sulfuric acid. BACKGROUND OF THE INVENTION [0003] Anhydrous hydrogen bromide is widely used as an intermediate in the chemical industry. It is utilized in the production of inorganic bromides by reaction with metal hydroxides, oxides, or carbonates; in the production of organic bromides by reaction wit...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C01B7/09
CPCC01B7/093C01D5/02
Inventor DEGROOT, RICHARD J.SHELLEF, DOV
Owner SHELLEF HLDG
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