# US 10,307,721 B2 · Reaction-regeneration device and process for alkane dehydrogenation to alkene > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,307,721 B2 - Document ID: US10307721B2 - Status: Granted - Kind: B2 - Application number: 15/887,399 - Filed: 2018-02-02 - Published: 2018-10-04 - Granted: 2019-06-04 - Earliest claimed: 2017-04-01 - Assignees: China University of Petroleum (East China) - Applicants: China University of Petroleum (East China) - Inventors: Chunyi Li; Guowei Wang - Web page: https://patentgrep.com/patent/US10307721B2 ## CPC - B01J 8/28: the one above the other - B01J 8/0055: {using cyclones} - B01J 8/0065: {by impingement against stationary members} - B01J 8/24: according to "fluidised-bed" technique (B01J8/20 takes precedence) - C07C 4/06: Catalytic processes {(C07C4/025 takes precedence)} - C07C 5/333: Catalytic processes - C10G 3/00: Production of liquid hydrocarbon mixtures from oxygen-containing organic materials, e.g. fatty oils, fatty acids (production from non-melting solid oxygen-containing carbonaceous materials C10G1/00) - C10G 11/182: {Regeneration} - C10G 11/187: {Controlling or regulating} - B01J 2208/00991: Disengagement zone in fluidised-bed reactors - C10G 2300/1081: Alkanes - C10G 2400/20: C2-C4 olefins - C10G 2400/22: Higher olefins - Y02P 30/20: using bio-feedstock - B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS - C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS - C10G: CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION (cracking to hydrogen or synthesis gas C01B; cracking or pyrolysis of hydrocarbon gases to individual hydrocarbons or mixtures thereof of definite or specified constitution C07C; cracking to cokes C10B); RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract A reaction-regeneration device for catalytic dehydrogenation or/and catalytic cracking of alkanes comprises a reaction device and a regeneration device. The reaction device comprises a reactor and a disengager, and the disengager is located at an upper part of the reactor. The reactor comprises a tapering section, and diameters of cross sections of the tapering section gradually decrease from bottom to top. Secondary conversion of alkenes caused by back-mixing is reduced, and thus the yield and selectivity to alkenes are increased. ## Claims ### Claim 1 A reaction-regeneration device for catalytic dehydrogenation or catalytic cracking of alkanes, comprising a reaction device and a regeneration device, the reaction device comprising a reactor and a disengager, the disengager being located above the reactor, wherein the reactor comprises a tapering section, and diameters of cross sections of the tapering section gradually decrease from bottom to top, a catalyst riser is arranged inside the reactor, and an outlet end of a regenerated catalyst conduit is connected with the catalyst riser. ### Claim 2 (depends on 1) The reaction-regeneration device according to claim 1, wherein the reactor comprises a dense-phase section and a dilute-phase section, the dense-phase section is located below the tapering section, and the dilute-phase section is located above the tapering section. ### Claim 3 (depends on 2) The reaction-regeneration device according to claim 2, wherein a height of the catalyst riser in the reactor is less than two thirds of a height of the dense-phase section. ### Claim 4 (depends on 2) The reaction-regeneration device according to claim 2, wherein the dilute-phase section of the reactor is connected with a cyclone separator in the disengager in an inserted manner. ### Claim 5 (depends on 1) The reaction-regeneration device according to claim 1, wherein a rising medium pipe is arranged in the catalyst riser. ### Claim 6 (depends on 5) The reaction-regeneration device according to claim 5, wherein an outlet end of the rising medium pipe is located at a position above an upper edge of a discharging opening of the regenerated catalyst conduit. ### Claim 7 (depends on 6) The reaction-regeneration device according to claim 6, wherein in an axial direction, the outlet end of the rising medium pipe is higher than the upper edge of the discharging opening of the regenerated catalyst conduit by a distance of no more than 0.1 m. ### Claim 8 (depends on 1) The reaction-regeneration device according to claim 1, wherein the catalyst riser extends into the reactor through the bottom of the reactor, and an outlet of the catalyst riser is located below the tapering section in the reactor. ### Claim 9 (depends on 1) The reaction-regeneration device according to claim 1, wherein the tapering section of the reactor is in the shape of a conical frustum, and an included angle between a generatrix and an axis of the conical frustum is smaller than 89 degrees. ### Claim 10 (depends on 1) The reaction-regeneration device according to claim 1, wherein the regeneration device comprises a regenerator for accommodating a catalyst and a regeneration disengager, and diameters of cross sections of the regenerator are decreased from top to bottom. ### Claim 11 (depends on 1) The reaction-regeneration device according to claim 1, wherein the regenerated catalyst conduit is connected with a bottom of the catalyst regenerator of the regeneration device, a first end of a spent catalyst conduit is connected with a side wall of the disengager close to a bottom, and a second end of the spent catalyst conduit is connected with the regeneration disengager of the regeneration device. ### Claim 12 (depends on 1) The reaction-regeneration device according to claim 1, wherein a feeding annular pipe is arranged in the reactor and is located at a position lower than an outlet of the catalyst riser. ### Claim 13 A reaction-regeneration device for catalytic dehydrogenation or catalytic cracking of alkanes, comprising a reaction device and a regeneration device, the reaction device comprising a reactor and a disengager, the disengager being located above the reactor, wherein the reactor comprises a tapering section, and diameters of cross sections of the tapering section gradually decrease from bottom to top, the regeneration device comprising a regenerator for accommodating a catalyst and a regeneration disengager, diameters of cross sections of the regenerator being decreased from top to bottom, wherein a circular pipe sleeve is arranged at a lower position inside the regenerator and is coaxial with the regenerator. ### Claim 14 (depends on 13) The reaction-regeneration device according to claim 13, wherein a height of the circular pipe sleeve in the regenerator is less than two thirds of a height of a catalyst dense-phase bed layer. ### Claim 15 A reaction device for producing alkenes through catalytic dehydrogenation-cracking of alkanes, comprising a catalytic dehydrogenation-cracking reactor and a disengager, the disengager being located above the reactor, wherein the reactor comprises a dense-phase dehydrogenation reaction section and a cracking reaction section, the cracking reaction section is located below the dense-phase dehydrogenation reaction section, the reactor further comprises a tapering section, the tapering section is located above the dense-phase dehydrogenation reaction section, diameters of cross sections of the tapering section are decreased from bottom to top, a catalyst riser extends into the cracking reaction section through a lower part of the cracking reaction section, and an outlet end of a regenerated catalyst conduit is connected with the catalyst riser. ### Claim 16 (depends on 15) The reaction device for producing alkenes through catalytic dehydrogenation-cracking of alkanes according to claim 15, wherein a diameter of a cross section of the cracking reaction section is smaller than that of the dense-phase dehydrogenation reaction section. ### Claim 17 (depends on 15) The reaction device for producing alkenes through catalytic dehydrogenation-cracking of alkanes according to claim 15, wherein the regenerated catalyst conduit and the catalyst riser are connected outside the cracking reaction section.