# US 5,326,916 A · Process for producing acrolein

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- Number: US 5,326,916 A
- Document ID: US5326916A
- Status: Granted
- Kind: A
- Application number: 08/028,534
- Filed: 1993-03-08
- Granted: 1994-07-05
- Earliest claimed: 1992-03-06
- Assignees: Sumitomo Chemical Company, Limited
- Inventors: Yoshinori Kobayashi; Yasuo Matsumoto; Tadashi Mizuno; Masamitu Fukuda
- Web page: https://patentgrep.com/patent/US5326916A

## CPC

- C07C 45/35: in propene or isobutene
- B01J 19/2465: {externally, i.e. the mixture leaving the vessel and subsequently re-entering it}
- C07C 45/783: {by gas-liquid treatment, e.g. by gas-liquid absorption}
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS

## Abstract

A process for producing acrolein which comprises bringing a reaction gas resulting from a catalytic oxidation of propylene into contact in a cooling tower with a condensate which is being circulated through the cooling tower and a circulating part, thereby to cool and separate the reaction gas and discharge an effluent gas from the cooling tower, the condensate in a bottom part of the cooling tower having a temperature of from 35.degree. to 50.degree. C., the effluent gas discharged from the cooling tower having a temperature of from 35.degree. to 55.degree. C., the temperature of the effluent gas being kept nearly equal to or higher than the temperature of the condensate in the bottom part of the cooling tower, and a process for producing acrolein which comprises bringing a reaction gas resulting from the catalytic oxidation of propylene into contact in a cooling tower with a condensate which is being circulated through the cooling tower and a circulating part, thereby to cool and separate the reaction gases, the period of the residence time of the condensate in the cooling tower and the circulating part being from 0.5 to 3 hours.

## Claims

### Claim 1

A process for producing acrolein which comprises bringing a reaction gas resulting from a catalytic oxidation of propylene into contact in a cooling tower with a condensate which is being circulated through said cooling tower and a circulating part, thereby to cool and separate said reaction gas and discharge an effluent gas from said cooling tower,
said condensate in a bottom part of said cooling tower having a temperature of from 35.degree. to 50.degree. C.,
said effluent gas discharged from said cooling tower having a temperature of from 35.degree. to 55.degree. C.,
the temperature of said effluent gas being kept nearly equal to or higher than the temperature of said condensate in said bottom part of said cooling tower.

### Claim 2 (depends on 1)

A process as claimed in claim 1, wherein part of said condensate to be circulated is cooled and circulated to said bottom part of the tower and to a top part of the tower, while the balance of said condensate is circulated, without being cooled, to said top part of the tower for cooling said reaction gas.

### Claim 3 (depends on 1)

A process as claimed in claim 1, wherein the temperature difference between said effluent gas and said condensate in said bottom part of the tower is from -2.degree. C. to +20.degree. C.

### Claim 4

A process for producing acrolein which comprises bringing a reaction gas resulting from the catalytic oxidation of propylene into contact in a cooling tower with a condensate which is being circulated through said cooling tower and a circulating part, thereby to cool and separate said reaction gases, the period of the residence time of said condensate in said cooling tower and said circulating part being from 0.5 to 3 hours.

### Claim 5 (depends on 1)

A process as claimed in claim 1, wherein the period of the residence time of said condensate in said cooling tower and said circulating part is from 0.5 to 3 hours.