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L.a. Daly Company

Eugene D Guth

John K Arand

LeGrand A Daly

Apparatus for the diacritic cracking of heavy hydrocarbon feeds includes a combustor for burning a fuel, to provide the hot combustion products to the reactor. The combustor is water cooled and includes gas filming with an appropriate gas such as N.sub.2 or CO.sub.2 to avoid coking in the combustor by preventing impingement of the fuel and combustion products on the combustor walls. The reactor is of reduced cross-section, also preferably utilizing gas filming to avoid coking on the reactor walls. Feed stock injectors are provided adjacent the reactor inlet. Adjacent the outlet end of the reactor is a quench section designed for the rapid injection of a quench fluid to reduce the stream temperature below that at which further cracking will take place, with the quench injectors also being gas filmed to avoid the coking thereof. Thereafter a tubular heat exchanger is provided to remove additional heat from the primary flow stream from the reactor for recovery purposes, the heat exchanger again using gas filming to minimize the build-up of coking and tar build-up, particularly encouraged by the rapidly decreasing temperatures. The gaseous products are then further quenched and cooled for processing by conventional means.

Apparatus for the diacritic cracking of hydrocarbon feeds for the

A continuous process for the selective production of ethylene by the diacritic cracking of heavy hydrocarbon feeds such as residual oils, heavy vacuum gas oils, atmospheric gas oils, crude oils and coal-derived liquids. The diacritic cracking takes place in a non-tubular multi-zone reactor at elevated pressures (e.g. 70-1000 p.s.i.a.) A fuel is combusted with oxygen in the first section of the multi-zone reactor. The high temperature products of combustion of the first zone pass into a second section of the reactor where the feed is atomized and cracked to yield products including ethylene, acetylene and synthesis gas. The reaction products of the second zone then pass into a third section in which they are quenched. In each stage of the reactor the present process seeks to prevent the build-up of coke deposits on the walls of the reactor. In the first two stages, a film of gas such as CO.sub.2 or N.sub.2 is injected along the inner walls to prevent build-up of coke. In the quench section, the liquid material introduced as the quenching fluid also acts as a barrier to prevent coking.

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Villa Park, CA, United States of America

Eugene D Guth