Absorbent

An absorbent and binder technology, applied in the field of metal sulfide absorbents, can solve the problems of reduced mercury capacity, difficult absorbent discharge, and long time.

Active Publication Date: 2011-01-12
JOHNSON MATTHEY PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Redeposition in use reduces mercury capacity due to loss of active copper sulfide surface area
Coalescing causes unacceptable pressure drop increases and makes draining the absorbent from the absorber difficult and lengthy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1 (comparison)

[0049] To assess the problems posed by the presence of water, 25 ml of 1-2 mm sized granulated absorbent containing sulphided copper and zinc compounds, an alumina carrier and a single cement binder were filled into a tubular laboratory-scale absorbent vessel (18 mm inner diameter ). The sulphided absorber had a copper content of 45% by weight (as oxide) and a zinc content of 22% by weight (as oxide).

[0050] The lower part of the bed consisted of 25% by volume of pre-soaked absorbent. The material was submerged in demineralized water for 30 minutes at ambient temperature, after which the water was decanted and the particles were dried to the touch with absorbent paper. The remaining upper portion of the bed was 75% by volume dry material. Use n-hexane saturated to about 1ppm (w / v) with elemental mercury at ambient temperature (about 20°C) for 7.0hr -1 A liquid hourly space velocity (LHSV) of 1000 was passed upward through the bed for ...

Embodiment 2

[0056] Embodiment 2 (dry test)

[0057] Absorbent precursor compositions were prepared in a granulator with the following compositions:

[0058] 20 or 30 parts by weight of quick-drying basic copper carbonate,

[0059] 80 or 70 parts by weight of alumina trihydrate,

[0060] 14 parts by weight binder comprising 10 parts calcium aluminate cement with a CaO content of about 40 wt % plus 4 parts attapulgite clay.

[0061] The granules were dried in air at 105° C. for 16 hours after 2 hours at ambient temperature (about 20° C.). The resulting particles range in size from 1-5 mm.

[0062] The granular material is in the laboratory in 1% H 2 sulfurized to saturation in S to produce an active absorbent.

[0063] The sulphurized absorbent was run in the test as described in Example 1, although in each case it was run dry without pre-soaking. The test was repeated on a commercially available presulfided 9 wt% Cu (as oxide) impregnated alumina absorbent. The results are depicte...

Embodiment 3

[0064] Embodiment 3 (humidity test)

[0065] Absorbent precursor compositions were prepared in a granulator with the following compositions:

[0066] 25 parts by weight of quick-drying basic copper carbonate,

[0067] 75 parts by weight of alumina trihydrate,

[0068] 14 parts by weight binder comprising 10 parts calcium aluminate cement with a CaO content of about 40 wt % plus 4 parts attapulgite clay.

[0069] The granules were dried in air at 105° C. for 16 hours after 2 hours at ambient temperature (about 20° C.). The resulting particles range in size from 1-5 mm.

[0070] The granular material is in the laboratory in 1% H 2 sulfurized to saturation in S to produce an active absorbent.

[0071] The sulfided absorbent was run as tested in Example 1 with the first 25 vol% of the bed presoaked in demineralized water. The test was repeated on a commercially available pre-sulfided 9 wt% Cu (as oxide) impregnated alumina absorbent, again where the first 25 vol% of the be...

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Abstract

An absorbent composition suitable for removing mercury, arsenic or antimony from fluid streams is described, comprising 5-50% by weight of a particulate sulphidedcopper compound, 30-90% by weight of a particulate support material, and the remainder one or more binders, wherein the metal sulphide content of the absorbent, other than copper sulphide, is below 5% by weight.

Description

technical field [0001] The present invention relates to absorbents, in particular to metal sulfide absorbents suitable for capturing mercury and / or arsenic and antimony from fluid streams. Background technique [0002] Mercury is present in small amounts in fluid streams such as hydrocarbons or other gas and liquid streams. Arsenic and antimony may also be present in small amounts in hydrocarbon streams. In addition to its toxicity, mercury can cause the failure of aluminum heat exchangers and other processing equipment. There is therefore a need for efficient removal of these metals from fluid streams, preferably as early as possible in the process flow. [0003] Copper sulfide mercury removal materials are known. US 4094777 discloses the use of a presulphided absorbent comprising copper sulphide for absorbing mercury from mercury-containing natural gas streams. The presulfurized absorbent is made by forming a precursor comprising basic copper carbonate and a refractory...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/02B01J20/28C10G25/00
CPCB01J20/0285B01J20/02B01J20/0237B01J20/28016C10G25/003B01J20/28011Y10S210/914C10G2300/205B01J20/2803B01J20/06B01J20/08B01J20/16
Inventor M·J·考辛斯C·J·永R·洛根
Owner JOHNSON MATTHEY PLC
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