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1. US20190375635 - Method for flexibly controlling the use of hydrochloric acid from chemical production

Office
United States of America
Application Number 16479083
Application Date 17.01.2018
Publication Number 20190375635
Publication Date 12.12.2019
Grant Number 11040878
Grant Date 22.06.2021
Publication Kind B2
IPC
C01B 7/04
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF
7Halogens; Halogen acids
01Chlorine; Hydrogen chloride
03Preparation from chlorides
04Preparation of chlorine from hydrogen chloride
C01B 7/07
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF
7Halogens; Halogen acids
01Chlorine; Hydrogen chloride
07Purification
C02F 1/46
CCHEMISTRY; METALLURGY
02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
1Treatment of water, waste water, or sewage
46by electrochemical methods
C02F 1/66
CCHEMISTRY; METALLURGY
02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
1Treatment of water, waste water, or sewage
66by neutralisation; pH adjustment
C02F 1/461
CCHEMISTRY; METALLURGY
02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
1Treatment of water, waste water, or sewage
46by electrochemical methods
461by electrolysis
C02F 101/12
CCHEMISTRY; METALLURGY
02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
101Nature of the contaminant
10Inorganic compounds
12Halogens or halogen-containing compounds
CPC
C01B 7/0706
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; ; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
7Halogens; Halogen acids
01Chlorine; Hydrogen chloride
07Purification ; ; Separation
0706of hydrogen chloride
C01B 7/04
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; ; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
7Halogens; Halogen acids
01Chlorine; Hydrogen chloride
03Preparation from chlorides
04Preparation of chlorine from hydrogen chloride
C02F 1/461
CCHEMISTRY; METALLURGY
02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
1Treatment of water, waste water, or sewage
46by electrochemical methods
461by electrolysis
C02F 1/66
CCHEMISTRY; METALLURGY
02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
1Treatment of water, waste water, or sewage
66by neutralisation; pH adjustment
C02F 2101/12
CCHEMISTRY; METALLURGY
02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
2101Nature of the contaminant
10Inorganic compounds
12Halogens or halogen-containing compounds
Applicants COVESTRO DEUTSCHLAND AG
Inventors Andreas Bulan
Johann Rechner
Rainer Weber
Juergen Hecke
Wolfgang Kern
Martin Leipnitz
Bernd Henning
Agents Faegre Drinker Biddle & Reath LLP
Priority Data 17152417 20.01.2017 EP
Title
(EN) Method for flexibly controlling the use of hydrochloric acid from chemical production
Abstract
(EN)

The invention relates to a method for flexibly controlling the use of hydrochloric acid having an HCl concentration of at least 10 wt %, in particular at a volume flow rate of at least 1 m3/h, obtained from a continuous chemical production process (A). In the method, purified hydrochloric acid (54) from a hydrochloric acid store (E) is optionally fed to a dispatch station (H), an HCl electrolysis station (F) and a chloralkali electrolysis station (L), which are consumption points for the hydrochloric acid, or to a neutralisation station (G) in that if one or more of said consumption points (H, F, L) is not available or if there are bottlenecks at the consumption points (H, F, L), the hydrochloric acid (54) is fed to the neutralisation station (G) and neutralised with concentrated alkali solution (55), in particular with concentrated sodium hydroxide solution, and the resulting salt solution (56) is fed either to the chloralkali process station (L) or to a disposal station (M).