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PROCESS AND APPARATUS FOR THERMAL CRACKING OF HYDROCARBONS

  • US 3,708,552 A
  • Filed: 11/03/1970
  • Issued: 01/02/1973
  • Est. Priority Date: 11/10/1966
  • Status: Expired due to Term
First Claim
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2. A method for producing olefins by the thermal cracking of hydrocarbons, comprising transferring a granular heat carrier, at high temperature, from a regenerator into a juxtaposed reaction column, maintaining the granular heat carrier, in the reaction column, in a concentrated floatable fluidized layer state by feeding superheated steam thereinto, feeding the raw material hydrocarbon to be thermally cracked into the upper part of the fluidized layer in the reaction column, feeding gaseous hydrocarbons or distilled oils into a reactor through a connecting part between the reactor and the top of the reaction column, to be thermally cracked under dilute fluidized layer conditions by means of the high temperature of the thermally cracked gas blown up into the reactor from the fluidized layer in the reaction column and the heat carried by the fine heat carrier accompanying the gas, thus simultaneously cooling all of the thermally cracked gas and recovering it with high efficiency by preventing the secondary reaction of unsaturated hydrocarbon produced in the fluidized layer in the reaction column, transferring the granular heat carrier from the reaction column into the regeneratoR, maintaining the granular heat carrier, in the regenerator, in a concentrated fluidized layer state, feeding air or fuel into the regenerator, burning the granular heat carrier in the upper part of the regenerator under concentrated floatable fluidized layer conditions, feeding air into a combustion and heating chamber through a connecting part between the combustion and heating chamber and the top of the regenerator, to burn combustible gas and fine powdery coke attached to the heat-carrying particles blown up into the combustion and heating chamber under dilute fluidized layer conditions from the regenerator, dropping the coarse coke grains produced in the combustion and heating chamber into the regenerator to thereby recover the heat generated in the combustion and heating chamber, and transferring the granular heat carrier regenerated and heated by said combustion into the reaction column.

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