RU98107655A

RU98107655A - EXOTHERM TWO-STAGE METHOD FOR CATALYTIC OXIDATION OF HYDROCHLORIDE

Info

Publication number: RU98107655A
Application number: RU98107655/12A
Authority: RU
Inventors: Дж.Майнет Рональд; М.Бенсон Сидней; К.Мортенсен Макс; Т.Тсотсис Теодор
Original assignee: Юниверсити Оф Сазерн Калифорния
Priority date: 1995-09-21
Filing date: 1996-09-20
Publication date: 2000-02-20

Claims

1. A method of extracting chlorine from a stream of hydrogen chloride, the steps of which include:
a) creating at least two reactors comprising a chlorination reactor and a combined oxidation reactor, and creating in the reaction zone inside the chlorination reactor a fluidized catalyst bed on a support containing bivalent copper oxide and bivalent copper chloride,
b) supplying a stream of hydrogen chloride and oxygen-containing gas to each reactor,
c) the interaction of the aforementioned stream of hydrogen chloride and oxygen-containing gas in a chlorine reactor with said fluidized bed of a catalyst on a support containing bivalent copper oxide and bivalent copper chloride at temperatures from 150 to 220 C under exothermic conditions with the conversion of a part of bivalent copper oxide to chloride divalent copper and divalent copper hydroxychloride, thereby significantly reducing the amount of hydrogen chloride, to obtain a stream of products, including chlorine, oxygen, inert gas and water that is removed from said chlorine reactor,
d) passing the supported catalyst stream obtained in step (c), which contains bivalent copper chloride, bivalent copper hydroxychloride and residual bivalent copper oxide from said chlorination reactor to a combined oxidation reactor to form a layer that operates at temperatures of approximately 300 - 400 ° C, in which the aforementioned combined oxidation reactor is fed with said stream of hydrogen chloride and an oxygen-containing gas to fluidize the bed and for an exothermic reaction with chlorine by bivalent copper and bivalent copper hydroxychloride in a supported catalyst to produce bivalent copper oxide and a stream of chlorine removed from the top of the reactor, unreacted hydrogen chloride, inert gases and residual oxygen,
e) feeding the supported catalyst stream obtained in step (d) and containing bivalent copper oxide to a chlorination reactor to react with hydrogen chloride, as described in c),
f) the flow of chlorine, hydrogen chloride, inert gases and oxygen from the combined oxidation reactor to the chlorine reactor removed from the top of the reactor to initiate the interaction of hydrogen chloride with bivalent copper oxide in the supported catalyst at an operating temperature of 150 - 220 ° C,
g) said product stream from a chlorination reactor enriched in chlorine but substantially free of free hydrogen chloride.

2. The method according to p. 1, in which heat is generated in both reactors in an exothermic process, and it is removed from both reactors for external use.

3. The method of claim 2, wherein the heat removed from the reactors is used to produce superheated steam.

4. The method according to claim 1, wherein said chlorine-rich product stream removed from the chlorine reactor is subjected to such processing to extract chlorine so that at least 99% of the chlorine contained in the hydrogen chloride supplied to said reactors is obtained in the form finished chlorine.

5. The method according to claim 1, wherein said supported catalyst comprises a carrier selected from the group consisting of alumina, zeolite, silica, and molecular sieve.

6. The method according to claim 1, including the removal of heat from said product stream from said chlorine reactor.

7. The method according to claim 1, comprising controlling the supply of hydrogen chloride and oxygen to the reactors.

8. The method according to claim 1, comprising using cyclone separators to remove fine particles from the fluidized beds in the reactors, as the product stream in step (c) and the flow from the top of the reactor in step (f) exit the reactors.