US 7,052,657 B2Granted

Method for controlling reaction and controlling apparatus

AssigneeDaicel Chemical Industries, Ltd.

InventorsHidehiko Nakajima, Yoshiyuki Harano

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Abstract

While supplying methanol and carbon monoxide via feed lines 17 and 19, respectively, to a liquid phase reaction system 3 including a carbonylation catalytic system, and maintaining a substantially constant liquid level of the reaction system, part of the reaction mixture containing the produced acetic acid is drawn out from the reaction system and supplied to a flash distillation column 4, and the high boiling point component, which contains the carbonylation catalytic system that has been separated by ths flash distillation, is circulated to the reaction system 3 by means of a circulation line 21. At circulation line 21, the flow rate is detected by a flow rate sensor F3 and the temperature is detected by a temperature sensor T2, and based on the detection data, a control unit 8 is used to control the temperature of the circulated high boiling point component by means of a temperature regulating unit 6 and thereby to suppress temperature and pressure fluctuations of the above-mentioned reaction system.

Claims12

Dependent claims

A reaction control method comprising supplying reaction components continuously into a liquid phase reaction system, subjecting continuously part of the reaction product in the reaction system to a separation step and circulating a separated liquid component that has been separated in the separation step to said reaction system,

wherein the reaction system is an exothermic reaction system, and the temperature of said reaction system is controlled in accordance with the following steps:
(i) detecting a flow rate and temperature of the circulated separated liquid component from said separation step,
(ii) calculating a heat quantity value of the circulated separated liquid component from said separation step, based on the flow rate and temperature detected in the detecting step (i), and
(iii) regulating the heat quantity of the circulated separated liquid component returned to the reaction system by means of controlling the temperature of the circulated separated liquid component based on a deviation between the heat quantity value of the circulated separated liquid component calculated in step (ii) and a predetermined reference heat quantity value serving as a reference for maintaining the temperature in the reaction system at a predetermined temperature.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 10/257,320Filed 15 Feb 2002
Priority: JP 2001/05476228 Feb 2001
Published: US 2003/0181760 A125 Sep 2003
Granted: 30 May 2006
Term ends: Not estimatedThe source records don’t support an estimate.

Classification22 codes

C07B 39/00
Halogenation
B01J 19/0013
Controlling or regulating processes: controlling the temperature of the process
C07C 51/12
By reaction with carbon monoxide: on an oxygen-containing group in organic compounds, e.g. alcohols
C07C 51/44
By change of the physical state, e.g. crystallisation: by distillation