Temperature control for aromatic alkylation process

Details Temperature control for aromatic alkylation process Temperature control for aromatic alkylation process

1987-07-01

1988-08-02

Davis, Curtis R.

Chemistry of hydrocarbon compounds

Aromatic compound synthesis

By condensation of entire molecules or entire hydrocarbyl...

C07C 268

Patent

active

047615133

ABSTRACT:
The quench system for a toluene methylation process is improved by using the methylating agent as a quench medium that is introduced between sequential reaction zones. A stream of toluene and any resulting alkylate product is passed sequentially through the reaction zones while the methylating agent in vapor or liquid form or a combinations thereof is added at points intermediate any two reaction zones. The proportion of vapor phase and liquid phase methanol is adjusted to control the enthalpy of the methylating agent and provide temperature reduction by the vaporization of the liquid component of the methylating agent. The control system for the methylating agent varies the total amount of methanol in the relative proportions of liquid and vapor phase in response to temperature and composition parameters measured at the inlet to any reaction zone. This arrangement is particularly beneficial where the methylating agent is corrosive and steam is used to inhibit the corrosive effects. A particular arrangement of this invention allows the steam to be added only as needed so that a minimum steam concentration can be maintained.

REFERENCES:
patent: 3007983 (1961-11-01), Clauson
patent: 3489818 (1970-01-01), Hervert
patent: 3751504 (1973-08-01), Keown et al.
patent: 4283306 (1981-08-01), Herkes
patent: 4444989 (1984-04-01), Herkes
patent: 4490570 (1984-12-01), Forward et al.

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