Distillation: processes – separatory – Addition of material to distilland to inhibit or prevent... – For scale inhibiting or corrosion preventing
Reexamination Certificate
2007-12-18
2007-12-18
Manoharan, Virginia (Department: 1764)
Distillation: processes, separatory
Addition of material to distilland to inhibit or prevent...
For scale inhibiting or corrosion preventing
C203S037000, C203S018000, C203S078000, C203S079000, C203S099000, C203SDIG019, C203SDIG023, C564S499000, C568S916000
Reexamination Certificate
active
10572783
ABSTRACT:
The invention relates to a method of avoiding corrosion in the separation of methylamine from a product stream (10) which is obtained in the preparation of methylamines by gas-phase reaction of methanol and ammonia and includes monomethylamine, dimethylamine, trimethylamine, ammonia and methanol as components, where ammonia is separated off by pure distillation in a first column (1), the remaining components of the product stream obtained as bottoms (12) are fed to a second column (2). Trimethylamine (14) is separated off in the second column (2) by extractive distillation with introduction of water. The further of the product stream obtained as bottoms (15) from the second column (2) are fed to a third column (3), in which monomethylamine and dimethylamine are separated off at the top. The monomethylamine and dimethylamine are separated by distillation in a fourth column (4). To avoid corrosion alkali metal hydroxide is added to the second or third column (3).
REFERENCES:
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Chemical Abstracts, Bd. 55, Nr. 24 (1961), Abstract No. 2444891, A. M. Sukhotin et al.: o “Corrosion of Installations for the Production of Methylamines”.
Julius Manfred
Reutemann Werner
Ross Karl-Heinz
Weber Theodor
BASF - Aktiengesellschaft
Connolly Bove Lodge & Hutz
Manoharan Virginia
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