Use of compositions having a content of 3,3′-methylenebis(5-methyloxazolidine) in the removal of sulphur compounds from process streams

• US 10,640,714 B2
• Filed: 12/13/2016
• Issued: 05/05/2020
• Est. Priority Date: 12/14/2015
• Status: Active Grant

• Current Assignee: Vink Chemicals GmbH & Co. KG
• Original Assignee: Vink Chemicals GmbH & Co. KG
• Inventors: Beilfuss, Wolfgang, Gradtke, Ralf, Krause, Stefanie, Knopf, Jennifer, Streek, Michael, Thiede, Joachim, Weber, Klaus
• Primary Examiner(s): Robinson, Renee
• Application Number:
  US16/061,781
• Publication Number:
  US 20180371334A1
• Time in Patent Office: 1,239 Days
• CPC Class Codes: B01D 19/0005 with one or more auxiliary substances
• CPC Class Codes: B01D 53/74 General processes for purification of waste gases; Apparatus or devices specially adapted therefor B01D53/92 takes precedence
• CPC Class Codes: B01D 53/78 with gas-liquid contact
• CPC Class Codes: C02F 1/68 by addition of specified substances, e.g. trace elements, for ameliorating potable water medicinal water A61K
• CPC Class Codes: C02F 2101/101 Sulfur compounds
• CPC Class Codes: C07D 413/06 linked by a carbon chain containing only aliphatic carbon atoms
• CPC Class Codes: C10G 21/27 Organic compounds not provided for in a single one of groups C10G21/14 - C10G21/26
• CPC Class Codes: C10G 2300/202 Heteroatoms content, i.e. S, N, O, P
• CPC Class Codes: C10G 2300/80 Additives
• CPC Class Codes: C10G 29/20 Organic compounds not containing metal atoms
• CPC Class Codes: C10L 3/10 Working-up natural gas or synthetic natural gas
• CPC Class Codes: C10L 3/103 Sulfur containing contaminants

Abstract

The invention relates to the use of a composition comprising a) 3,3′-methylenebis(5-methyl oxazolidine) and b) one or more additives selected from among (i) urea, urea derivatives, amino acids, guanidine and guanidine derivatives and (ii) 1,2-diols in the removal of sulphur compounds from process streams. The composition is preferably used in the removal of hydrogen sulphide from process streams.

Claims

1. A method for removing sulphur compounds from liquid or gaseous process streams comprising a step of contacting the liquid or gaseous process stream with a composition comprising:

a) 3,3′

-methylenebis(5-methyloxazolidine) and

b) urea.

2. The method according to claim 1, characterized in that the composition is in the form of a concentrate and comprises from 60 to 99% by weight of 3,3′

-methylenebis(5-methyloxazolidine).

3. The method according to claim 2, characterized in that the composition is in the form of a concentrate and comprises from 70 to 97% by weight of 3,3′

-methylenebis(5-methyloxazolidine).

4. The method according to claim 3, characterized in that the composition is in the form of a concentrate and comprises from 80 to 92% by weight of 3,3′

-methylenebis(5-methyloxazolidine).

5. The method according to claim 1, characterized in that the composition is in the form of a concentrate and comprises from 1 to 20% by weight of urea.

6. The method according to claim 5, characterized in that the composition is in the form of a concentrate and comprises from 2 to 14% by weight of urea.

7. The method according to claim 6, characterized in that the composition is in the form of a concentrate and comprises from 2.5 to 8% by weight of urea.

8. The method according to claim 1, characterized in that the composition further comprises one or more 1,2-diols.

9. The method according to claim 8, characterized in that the composition is in the form of a concentrate and comprises from 1 to 25% by weight of 1,2-diol.

10. The method according to claim 9, characterized in that the composition is in the form of a concentrate and comprises from 3 to 20% by weight of 1,2-diol.

11. The method according to claim 10, characterized in that the composition is in the form of a concentrate and comprises from 5 to 15% by weight of 1,2-diol.

12. The method according to claim 8, characterized in that the 1,2-diol is selected from the group consisting of ethylene glycol, propylene glycol and mixtures thereof.

13. The method according to claim 12, characterized in that the 1,2-diol is ethylene glycol.

14. The method according to claim 1, characterized in that the composition further comprises c) N,N-dialkyl hydroxylamine of the formula RR′

NOH, where R and R′

are selected independently from among linear, branched and cyclic C₁-C₁₀-alkyl groups.

15. The method according to claim 14, characterized in that the N,N-dialkyl hydroxylamine is N,N-diethyl hydroxylamine.

16. The method according to claim 1, characterized in that the process stream contains not more than 40% by weight of water.

17. The method according to claim 1, characterized in that the process stream is a hydrocarbon stream.

18. The method according to claim 1, characterized in that the sulphur compound is selected from the group consisting of hydrogen sulphide, inorganic and organic sulphides, mercaptans and mercaptides.

19. The method according to claim 18, characterized in that the sulphur compound is hydrogen sulphide.

20. A method for removing sulphur compounds from process streams comprising a step of contacting the process stream with a composition comprising:

a) 3,3′

-methylenebis(5-methyloxazolidine) and

b) urea,

wherein the process streams are selected from the group consisting of hydrocarbon streams, petroleum, crude oil, mineral oil, heating oil, diesel fuel, bitumen, distillation residues, drilling fluids and wastewater.