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Silicone defoamer to better control hydrocarbon foam and reduce silicon content of liquid hydrocarbon products

A liquid and foam technology, applied in the field of controlling foaming of hydrocarbon liquids

Active Publication Date: 2007-01-03
BAKER HUGHES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the unique surface properties and thermal stability of silicone oils, there are no commercially available non-silicone alternatives to defoamers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0025] Embodiment 1-4-stability test

[0026] The formulations shown in Table I were prepared.

[0027] components

Examples→

1

2

3

4

Cross-linked PDMS

600K cst linear PDMS

100K cst linear PDMS

kerosene

total

1.01

6.00

-

92.80

99.81

0.52

3.03

-

46.57

50.06

0.52

-

5.70

45.20

51.42

0.52

-

5.60

44.00

50.12

[0028] The formulations of Examples 1-4 were placed into an oven at 120°F (49°C) for storage stability testing. After one week, all samples were clear and free flowing without delamination. At two weeks, all samples had low viscosity with no settling or separation.

[0029] Examples 5 and 6 - Field Test - First Refinery Trial

[0030] Field trials were conducted using the formulation of Example 5 with 93 wt% kerosene, 1% cross-linked PDMS and 6% 600,000 cst linear PDMS. A typical procedure is to first place kerosen...

Embodiment 7-13

[0041] Pilot Plant Testing Using Foam Control Compositions

[0042] The foam control / antifoam agent samples used in Examples 7-13 are described in Table V. The crosslinked branched PDMS formulations (a)-(e) differ from each other in terms of molecular weight and branching agent used. Materials (a) and (c) are alkyl polysilicate crosslinked materials, while materials (b), (d) and (e) are silicone crosslinked materials. The differences between materials (a) and (c) are: (a) contains 40% Indopol L-14 polybutene from BP Chemicals. Material (b) was from 30,000 cst PDMS (the highest molecular weight PDMS in groups (a)-(e)). Materials (d) and (e) have different ratios of PDMS to crosslinker, but as will be seen this does not appear to make much difference. Material (e) and possibly material (de) come from PDMS which has a lower molecular weight than material (a). Amounts reported are in volume percent.

[0043] Table V

[0044] combina...

Embodiment 14

[0053] Example 14 - Second Refinery Trial

[0054] The antifoam compositions of Examples 5 and 6 were tested in a refinery coker producing anode coke. Due in part to the excessive use of defoamers, this operation has been difficult due to silicon in the product poisoning downstream catalysts. This operation has continued for four years using the formulation of Comparative Example 6 (600,000 cst linear PDMS antifoam). The results are shown in Table VII below.

[0055] Table VII

[0056] tank 1

product

Comparative example 6-Si(ppm)

Embodiment 5-Si (ppm) of the present invention

reduce%

naphtha

LCGO

HCGO

58

38.8

5.5

35.9

10.3

2.2

38％

73％

60％

tank 2

naphtha

LCGO

HCGO

33.8

28.7

1.8

8.2

3.2

0.9

75％

88％

50％

[0057] LCGO = light coker gas oil

[0058] HCGO = heavy coker gas oil

[0059] I...

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PUM

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Abstract

Crosslinked polydimethylsiloxane (PDMS) resins have now been found useful as defoamers and antifoams for hydrocarbon-containing liquids such as delayed coker feeds and pre-flash and atmospheric column feeds. These PDMS resins are crosslinked with polyalkyl silicates or siloxanes. The cross-linked PDMS resin can be used alone or with linear PDMS and is often blended with a carrier such as kerosene for easier handling. Importantly, the use of cross-linked branched PDMS resins allows a reduction in the total amount of polysiloxane to be used, which results in less silicon carryover in the coker product and less downstream catalyst poisoning.

Description

field of invention [0001] The present invention relates to methods and compositions for controlling foaming of hydrocarbon liquids, and in one embodiment, more particularly to methods and compositions for preventing or reducing foaming of coker feedstocks using polydimethylsiloxanes, The polydimethylsiloxane reduces the silicon content of the coker liquid product. Background of the invention [0002] Many petroleum refineries utilize delayed cokers to process residues. In delayed coking, the overhead vapor from the coking drum is sent to a fractionation column where the various fractions are separated. One of the fractions is a gasoline boiling range stream. This stream, commonly referred to as coker gasoline or coker naphtha, is generally a relatively low octane stream, unsuitable for use as an automotive fuel without upgrading. Due to the restrictions imposed on octane boosting additives for environmental reasons, it has become desirable to process coker / naphtha in octa...

Claims

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Application Information

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IPC IPC(8): B01D19/04C10G9/00C10M171/00
Inventor L·N·克莫尔
Owner BAKER HUGHES INC
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