Removable filter for slurry hydrocarbon synthesis process

• US 6,344,490 B1
• Filed: 01/22/1999
• Issued: 02/05/2002
• Est. Priority Date: 01/22/1999
• Status: Expired due to Fees

• Current Assignee: Exxon Research and Engineering Company (Exxon Mobil Corporation)
• Original Assignee: Exxon Research and Engineering Company (Exxon Mobil Corporation)
• Inventors: DeGeorge, Charles W., Thompson, Barry J.
• Primary Examiner(s): Padmanabhan, Sreeni
• Assistant Examiner(s): PARSA, JAFAR F
• Application Number:
  US09/236,151
• Time in Patent Office: 1,110 Days
• Field of Search: 518/700, 208/177
• US Class Current: 518/700
• CPC Class Codes: B01D 2201/0438 mounted substantially vertically on plates at the lower side of the filter elements
• CPC Class Codes: B01D 2201/0446 suspended from plates at the upper side of the filter elements
• CPC Class Codes: B01D 2201/0484 suspended from collector tubes at the upper side of the filter elements
• CPC Class Codes: B01D 29/114 arranged for inward flow filtration B01D29/15, B01D29/33 take precedence
• CPC Class Codes: B01D 29/52 in parallel connection
• CPC Class Codes: B01D 29/96 in which the filtering elements are moved between filtering operations; Particular measures for removing or replacing the filtering elements; Transport systems for filters B01D29/09, B01D29/70 take precedence
• CPC Class Codes: B01J 8/006 by filtration
• CPC Class Codes: B01J 8/22 gas being introduced into the liquid
• CPC Class Codes: C10G 2/343 according to the "moving-bed" method

Abstract

A removable filter for separating and filtering slurry liquid from solid particles includes one or more filter sections connected by a filtrate conduit. Each section comprises a plurality of vertical, hollow, sintered metal filter elements horizontally arranged across a manifold connected to a hollow filtrate conduit. The sections are vertically stacked and connected by the conduit(s) to form the filter which is removably secured in the slurry by means which permit it to be removed vertically up and out of the top of the reactor. This filter has a high surface area to volume ratio and is useful for removing the liquid hydrocarbon products from a slurry hydrocarbon synthesis reactor and can easily be replaced without having to drain out the slurry.

Claims

1. In a slurry hydrocarbon synthesis process for forming hydrocarbons wherein

(a) a synthesis gas comprising a mixture of H₂ and CO is reacted in the presence of a solid, particulate hydrocarbon synthesis catalyst in a slurry in a hydrocarbon synthesis reactor at reaction conditions effective to form hydrocarbons, at least a portion of which are liquid hydrocarbons at the reaction conditions, wherein the slurry comprises the catalyst and gas bubbles comprising the synthesis gas in a slurry hydrocarbon liquid, and wherein the slurry hydrocarbon liquid comprises the liquid hydrocarbons,

(b) the slurry is directly contacted with a filter having a separating wall encompassing an interior,

(c) part of the slurry hydrocarbon liquid is passed through the separating wall and into the interior as a filtrate, and

(d) the filtrate is passed from the interior out of the reactor;

wherein the improvement comprises;

directly contacting the slurry with the filter which includes a plurality of hollow filter elements each having the separating wall encompassing the interior, arrayed across a manifold connected to a filtrate conduit, with the interior, the manifold, and the conduit in fluid communication, and wherein the separating wall is permeable to the slurry hydrocarbon liquid but not the slurry solids, and

passing the filtrate out of the reactor by successively passing the filtrate from the interior, through the manifold, and through the filtrate conduit.

2. A process according to claim 1 wherein said filter is immersed in said slurry.

3. A process according to claim 2 wherein said filter is in either said reactor or in an external filtration vessel.

4. A process according to claim 3 wherein said filter has an area to volume ratio of at least 4.3 ft⁻

1.

5. A process according to claim 4 wherein said filter is removably secured in said reactor or vessel by means which permit it to be removed vertically upward and out the top of said reactor.

6. A process according to claim 5 wherein at least a portion of said filtrate is upgraded to more valuable product by fractionation and/or one or more conversion operations.

7. A process according to claim 6 wherein said filter has an area to volume ratio of at least 5.9 ft⁻

1.

8. A process according to claim 1 wherein at least a portion of said filtrate is upgraded to more valuable product by fractionation and/or one or more conversion operations.