Process and plant for thermal decomposition of aluminium chloride hydrate into aluminium oxide

Patent metadata

Field	Value
Publication number	US-2023183086-A1
Application number	US-202318106536-A
Country	US
Kind code	A1
Filing date	Feb 7, 2023
Priority date	Jun 7, 2019
Publication date	Jun 15, 2023
Grant date	—

Abstract

A process and its relating plant for thermal conversion of aluminum chloride hydrate into aluminum oxide and gaseous hydrogen chloride. In a first step, aluminum chloride hydrate is fed into a decomposition reactor where it is heated to a temperature between 120 and 400° C. Afterwards, the partially decomposed aluminum chloride hydrate is finally calcined to aluminum oxide at a temperature between 850 and 1200° C. in a second reactor. The aluminum chloride hydrate is admixed with aluminum oxide in an intensive mixer with a mass ratio between 1:1 and 10:1 aluminum chloride hydrate to aluminum oxide for using a fluidized bed reactor as a decomposition reactor.

First claim

1 .- 16 . (canceled)

17 . A plant for thermal conversion of aluminum chloride hydrate into aluminum oxide and gaseous hydrogen chloride comprising a decomposition reactor for decomposing the aluminum chloride hydrate and a calcination reactor for calcining the partially decomposed aluminum chloride hydrate to aluminum oxide, characterized by a mixer with knifes and/or ploughshares and/or paddles, wherein the aluminum chloride hydrate is mixed with aluminum oxide and that the decomposition reactor is a fluidized bed reactor.

18 . The plant according to claim 17 , wherein the decomposition reactor is designed such that it is able to heat the material to a first temperature while the calcination reactor is designed to heat the material to a second temperature being higher than the first temperature.

Assignees

• Metso Outotec Finland Oy

Inventors

• Von Garnier Agnes
• Perander Linus
• Schneider Günter
• Sturm Peter

Classifications

• C01F7/306 Primary

  Thermal decomposition of hydrated chlorides, e.g. of aluminium trichloride hexahydrate · CPC title

• B01J8/38

  with fluidised bed containing a rotatable device or being subject to rotation {or to a circulatory movement, i.e. leaving a vessel and subsequently re-entering it} · CPC title

• C01B7/035

  Preparation of hydrogen chloride from chlorides · CPC title

• Y02E60/36

  Hydrogen production from non-carbon containing sources, e.g. by water electrolysis · CPC title