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Inhibition of amine oxidation

An amine oxidation and inhibitor technology, applied in the preparation of organic compounds, the preparation of aminohydroxy compounds, organic chemistry, etc., can solve problems such as allergic reactions

Active Publication Date: 2012-10-17
HUNTSMAN PETROCHEMICAL LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, it may cause allergic reactions in persons sensitive to formaldehyde and may be a human carcinogen

Method used

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  • Inhibition of amine oxidation
  • Inhibition of amine oxidation
  • Inhibition of amine oxidation

Examples

Experimental program
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Effect test

Embodiment 1

[0041] In Examples 1a-1c, the concentrations of DMF and formaldehyde in samples mixed with tertiary amines and methimazole (MM) were recorded. Generally, bis(2-dimethylaminoethyl) ether (JEFFCAT ZF-20 amine catalyst, available from Huntsman Petrochemical LLC, The Woodlands, Texas) Prepare 50 ml of methimazole (amine oxidation inhibitor) solutions at 10, 100, 250 and 1000 ppm, respectively. Methimazole is commercially available from Sigma-Aldrich Corp., St. Louis, MO.

[0042] 8ml aliquots of each of the above formulations were poured into corresponding 20ml vials, and untreated JEFFCAT 8ml aliquots of ZF-20 amine catalyst were poured into separate 20ml vials. Thus, there were five 20ml vials in one set; at least one sample in each set contained 0, 10, 100, 250 or 1000 ppm methimazole. Sample sets were incubated at 25°C, 40°C, or 70°C. An aliquot (approximately 0.4 ml) of each sample was withdrawn periodically to test the concentration of DMF and / or formaldehyde formed in...

Embodiment 1a

[0044] In this example, the DMF and formaldehyde concentrations were recorded in a set of samples incubated at room temperature (approximately 25° C.) for up to 680 days. Sample 1a (pure ZF-20) is a comparative sample without methimazole, while Examples 2a, 3a, 4a and 5a are test samples that include 10, 100, 250 and 1000 ppm of methimazole, respectively. Before incubation, a baseline of DMF and formaldehyde concentrations was determined. Thereafter, the DMF and formaldehyde concentrations of each sample in the group were regularly determined.

[0045] refer to image 3 , shows the DMF concentration (ppm) of samples 1a-5a at different time points. The samples did not show appreciable differences in DMF accumulation after approximately 1 day (18 hours) of incubation. However, thereafter, the DMF concentration in sample 1a started to rise compared to the test sample, and at 12 days and beyond, the difference in DMF concentration between the comparative sample 1a and the test ...

Embodiment 1b

[0056] In this example, a set of samples was measured for the presence of DMF after a total of 39 days in an oven at 40°C. Sample 1b is a comparative sample without methimazole, while Examples 2b, 3b, 4b and 5b are test samples which include 10, 100, 250 and 1000 ppm of methimazole, respectively.

[0057] refer to Figure 4 , shows the DMF concentrations for samples 1a to 5b. Like Comparative Sample 1a, Comparative Sample 1b showed a steady increase in DMF concentration over 39 days. In contrast, samples 2b-5b had reduced DMF formation over time compared to comparative sample 1b. The most effective concentration of methimazole at 40°C is 1000ppm. Interestingly, after 18 days incubation at 40°C, sample 4b containing 250 ppm methimazole was not as effective as sample 3b containing 100 ppm methimazole.

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Abstract

In an embodiment, an amine-oxidation inhibitor, such as a free radical scavenger and / or antioxidant, is added to an oxidation-sensitive amine, such as an amine catalyst, to inhibit oxidation of the amine. The inhibitor-treated amine may then be used in an application such as a polyurethane application to reduce the emission of undesired oxidation products from the polyurethane.

Description

[0001] Cross-References to Associated Applications [0002] This application has claimed priority to US Application No. 61 / 293,388 filed January 8, 2010, which is incorporated herein by reference. technical field [0003] The present invention relates generally to preventing the formation or reducing the presence of oxidative degradation products in oxidation-sensitive amines, and more particularly to preventing the formation or reducing the presence of formaldehyde and / or dimethylformamide in oxidation-sensitive amines. Background technique [0004] Amines, such as the amine catalysts used in the polyurethane industry, can degrade over time or with exposure to air. Amine degradation can produce undesired products such as formaldehyde and dimethylformamide (DMF) or both. For example, formaldehyde may be formed from oxidative demethylation of amines and DMF may be formed from certain tertiary amines via figure 1 A similar oxidation process is shown to form. Formaldehyde an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/18C08J9/00
CPCC08G18/4841C08G18/7671C08G2101/0008C08G2101/0083C08K5/005C08G18/1825C08G18/1833C08G2110/0008C08G2110/0083C07C213/10C08G18/14C08G18/40
Inventor B·N·巴曼R·A·小葛丽戈斯比
Owner HUNTSMAN PETROCHEMICAL LLC
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