EP0102343A1
Expired / Lapsed
EP
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Process for producing nitrilotriacetonitrile
Assignee: Monsanto Co
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Filing: 1983-08-25
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Granted: —
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Expires: 2003-08-25
Abstract
Abstract A process for producing nitrilotriacetonitrile from an ammonia derivative, formaldehyde, and hydrogen cyanide, in which hydrogen cyanide is scrubbed from a gas stream (14, 28) containing hydrogen cyanide with a solution (15, 29) containing nitrilotriacetonitrile mother liquor which is used directly in the nitrilotriacetonitrile production without the purification process normally used to produce hydrogen cyanide.
Inventors
- 👤 Chung Yu Shen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 22:56
CPC Classifications
C; C07; C07C; C07C255/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
71 words
A process for producing nitrilotriacetonitrile comprising: a. producing a gas stream containing hydrogen cyanide; b. scrubbing said gas stream with an aqueous solution containing nitrilotriacetonitrile mother liquor, to produce a hydrogen cyanide-containing solution; c. adding formaldehyde and an ammonia derivative selected from the group consisting of ammonia, an ammonium salt, and hexamethylenetetramine, to said hydrogen cyanide-containing solution, to produce a reaction mixture; and d. reacting said reaction mixture to produce nitrilotriacetonitrile.
Claim 2
Dependent Claim
71 words
A process for producing nitrilotriacetonitrile comprising: a. producing a gas stream containing hydrogen cyanide; b. scrubbing said gas stream with an aqueous solution containing nitrilotriacetonitrile mother liquor, to produce a hydrogen cyanide-containing solution; c. adding formaldehyde and an ammonia derivative selected from the group consisting of ammonia, an ammonium salt, and hexamethylenetetramine, to said hydrogen cyanide-containing solution, to produce a reaction mixture; and d. reacting said reaction mixture to produce nitrilotriacetonitrile.
Claim 3
Dependent Claim
11 words
The process of Claim 1 wherein the ammonia derivative is hexamethylenetetramine.
Claim 4
Dependent Claim
15 words
The process of Claim 1 wherein the ammonia derivative is ammonia or an ammonium salt.
Claim 5
Dependent Claim
34 words
The process of Claim I wherein the gas stream containing hydrogen cyanide is produced by reacting methane, ammonia, and oxygen in the presence of a metal catalyst from Group VIII of the Periodic Table.
Claim 6
Dependent Claim
24 words
The process of Claim 1 wherein the gas stream containing hydrogen cyanide is produced by reacting methane and ammonia in an indirectly heated reactor.
Claim 7
Dependent Claim
26 words
The process of Claim 1 wherein the gas stream containing hydrogen cyanide is produced by reacting ammonia and propane in an electrically heated fluidized carbon bed.
Claim 8
Dependent Claim
13 words
The process of Claim 1 wherein the aqueous scrubbing solution contains sulfuric acid.
Claim 9
Dependent Claim
18 words
The process of Claim 7 wherein the apparent concentration of sulfuric acid is about 10% to about 25X.
Claim 10
Dependent Claim
18 words
The process of Claim 1 wherein the hydrogen cyanide-containing solution contains about 10% to about 60X hydrogen cyanide.
Claim 11
Dependent Claim
18 words
The process of Claim 1 wherein the hydrogen cyanide-containing solution contains about 20% to about 40X hydrogen cyanide.
Claim 12
Dependent Claim
22 words
The process of Claim 1, further comprising treating the gas stream containing hydrogen cyanide to remove ammonia, prior to scrubbing of (b).
References Cited (Backward Citations)
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