GB657252A - Improvements in or relating to the treatment of pyrolysis apparatus - Google Patents
Improvements in or relating to the treatment of pyrolysis apparatusInfo
- Publication number
- GB657252A GB657252A GB1103/49A GB110349A GB657252A GB 657252 A GB657252 A GB 657252A GB 1103/49 A GB1103/49 A GB 1103/49A GB 110349 A GB110349 A GB 110349A GB 657252 A GB657252 A GB 657252A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per
- coke
- temperature
- per cent
- pyrolysis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
- B01J19/002—Avoiding undesirable reactions or side-effects, e.g. avoiding explosions, or improving the yield by suppressing side-reactions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
- B01J19/002—Avoiding undesirable reactions or side-effects, e.g. avoiding explosions, or improving the yield by suppressing side-reactions
- B01J19/0026—Avoiding carbon deposits
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/87—Preparation of ketenes or dimeric ketenes
- C07C45/88—Preparation of ketenes or dimeric ketenes from ketones
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/87—Preparation of ketenes or dimeric ketenes
- C07C45/89—Preparation of ketenes or dimeric ketenes from carboxylic acids, their anhydrides, esters or halides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00245—Avoiding undesirable reactions or side-effects
- B01J2219/00252—Formation of deposits other than coke
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The inner surface of cracking vessels made of high nickel high chromium steel is subjected to a pyrolysis reaction until a substantial amount of coke has been deposited thereon, then treated with steam and air at 1400-1800 DEG F. until the coke is removed, the process being repeated until deposition of coke ceases and the temperature during the last few regenerating stages being 1400-1500 DEG F. The vessel may be in the form of a long tube, which may be coiled, formed from an alloy comprising 23-27 per cent Cr., 12-20 per cent Ni, less than 0.2 per cent C, the balance being iron. The temperature may be reduced to 1100 DEG F. between each regeneration and pyrolysis stage and brought back to pyrolysis temperature at 10-50 DEG F. per hour, during which time the substance to be cracked, e.g. acetone, is passed through at a mass velocity of 10-50 lbs. per sq. ft. per second and with a contact time of 0.1 to 1.0 second.ALSO:The inner surface of cracking vessels made of high-nickel high-chromium steel is subjected to a pyrolysis reaction until a substantial amount of coke has been deposited thereon, then treated with steam and air at 1400-1800 DEG F until the coke is removed, the process being repeated until deposition of coke ceases and the temperature during the last few regenerating stages being 1400-1500 DEG F. The vessel may be in the form of a long tube, which may be coiled, formed from an alloy comprising 23-27 per cent Cr, 12-20 per cent Ni, less than 0.2 per cent C the balance being iron. The temperature may be reduced to below 1100 DEG F between each regeneration and pyrolysis stage and brought back to pyrolysis temperature at 10-50 DEG F per hour, during which time the substance to be cracked, e.g. acetone, is passed through at a mass velocity of 10-15 lbs. per sq. ft. per second and with a contact time of 0.1 to 1.0 second.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US657252XA | 1948-06-04 | 1948-06-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB657252A true GB657252A (en) | 1951-09-12 |
Family
ID=22064670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1103/49A Expired GB657252A (en) | 1948-06-04 | 1949-01-14 | Improvements in or relating to the treatment of pyrolysis apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB657252A (en) |
-
1949
- 1949-01-14 GB GB1103/49A patent/GB657252A/en not_active Expired
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