Oil slurry filter, oil slurry filter unit and oil slurry filter system containing the same, and oil slurry filtering process

Patent metadata

Field	Value
Publication number	US-12226725-B2
Application number	US-202017432719-A
Country	US
Kind code	B2
Filing date	Feb 20, 2020
Priority date	Feb 20, 2019
Publication date	Feb 18, 2025
Grant date	Feb 18, 2025

Abstract

The present invention provides an oil slurry filter, a filter unit including the oil slurry filter, a multiple-filter system including the oil slurry filter, and a multiple-stage filter system including the oil slurry filter. Due to the use of the filter component of flexible texture in the oil slurry filter of the present invention, the problems that the filter material is easily blocked by high-viscosity colloidal impurities, the regeneration efficiency of the filter is poor and the filtration efficiency is low are solved, and it is possible to make the backwash treatment of the filter residue more convenient and improve the regeneration efficiency of the filter. The present invention also provides a filtering process using the oil slurry filter to ensure long-term stable operation of the oil slurry filtering process.

First claim

The invention claimed is:

1. An oil slurry filter, which comprises at least one filter component of flexible texture, said filter component of flexible texture is formed from flexible filter material, said flexible filter material is made from at least one material selected from polypropylene, polyethylene, nylon, polyamide fiber, polyester fiber, polypropylene fiber, polyphenylene sulfide, polyimide, polytetrafluoroethylene, aramid fiber, polyurethane, glass fiber, and vinylon,
wherein said flexible filter material has a basis weight of 300-1000 g/m 2 ; a warp-direction breaking strength of 850 N/5 cm-9000 N/5 cm, a weft-direction breaking strength of 1000 N/5 cm-11000 N/5 cm; a thickness of 0.5-3.4 mm,
wherein said flexible filter material at least includes a solid-removal layer and a base cloth layer; said solid-removal layer and said base cloth layer are provided adjacently, said solid-removal layer has a porosity of 85%-98%; said base cloth layer has a porosity of 30%-40%, the flexible filter material has a filtering precision of 0.1-25 micrometers;
wherein the filter is an up-flow filter, said oil slurry filter includes an oil slurry inlet arranged at a lower part of the filter, a filtered oil outlet arranged at an upper part of the filter, a filter residue outlet arranged at the lower part and/or a bottom of the filter, and a purge medium inlet arranged at a top and/or the upper part of the filter.

2. The oil slurry filter according to claim 1 , wherein said filter component of flexible texture is in the form of a flexible filter bag, the flexible filter bag is prepared by a stitching process, and the pores from stitching are sealed with an acidic sealant material.

3. The oil slurry filter according to claim 1 , wherein said flexible filter material has a filtering precision of 0.1-15 micrometers; or
the flexible filter material has a filtering precision of 2-15 micrometers; or
the flexible filter material has a filtering precision of 3-25 micrometers; or
the flexible filter material has a filtering precision of 0.1 to less than 2 micrometers.

4. The oil slurry filter according to claim 1 , wherein said base cloth layer is made from polytetrafluoroethylene or polyphenylene sulfide; said solid-removal layer is made from polytetrafluoroethylene with a three-dimensional void structure.

5. The oil slurry filter according to claim 1 , wherein said flexible filter material at least includes the solid-removal layer, the base cloth layer and a lining layer, said lining layer is located on a side of the base cloth layer opposite to the solid-removal layer, and made from fibers having a fineness of 1-3 D; a raw material of fibers of which said lining layer is made is one or more materials selected from polyethylene, nylon, polyester fiber, polypropylene fiber, polyphenylene sulfide, polyimide, polytetrafluoroethylene, aramid fiber, polyurethane, and glass fiber.

6. The oil slurry filter according to claim 1 , wherein said flexible filter material at least includes the solid-removal layer, a precision layer, said base cloth layer and a lining layer, said precision layer is located between the solid-removal layer and the base cloth layer, and said precision layer is made from superfine fibers having a fineness of 0.2-0.3 D; a raw material of fibers of which said precision layer is made is one or more materials selected from polyethylene, nylon, polyester fiber, polypropylene fiber, polyphenylene sulfide, polyimide, polytetrafluoroethylene, aramid fiber, polyurethane, and glass fiber.

7. The oil slurry filter according to claim 1 , wherein the filter component of flexible texture includes a filter cake layer formed from a filter aid provided on said filter component; said filter aid is selected from diatomite, cellulose, perlite, talcum powder, activated clay, filter residue obtained from a filter, spent catalytic cracking catalysts or mixtures thereof; the filter cake layer formed from the filter aid has a thickness of 0.1-10 mm.

8. An oil slurry filter unit, which includes at least two oil slurry filters according to claim 1 , said oil slurry filters are in series connection or parallel connection.

9. The oil slurry filter unit according to claim 8 , which includes an oil slurry inlet pipeline and a filtered oil outlet pipeline respectively in communication with each filter; optionally a filter residue discharge pipeline respectively in communication with each filter; optionally a purge medium buffer tank and a purge medium inlet pipeline respectively in communication with each filter; optionally a filter aid buffer tank and a filter aid inlet pipeline respectively in communication with each filter.

10. The oil slurry filter unit according to claim 9 , wherein said purge medium is an inert gas or a flushing oil; said filter aid is selected from diatomite, cellulose, perlite, talcum powder, activated clay, filter residue obtained from a filter, spent catalytic cracking catalysts or mixtures thereof; the filter aid and a mixing medium are loaded in a filter aid buffer tank, said mixing medium is a liquid hydrocarbon.

11. A multiple-filter system for an oil slurry filtration, which includes a filter system and a control system;
the filter system includes the oil slurry filter unit according to claim 8 ;
said control system includes an online pressure difference monitoring module, a filter control module and a purge control module, said online pressure difference monitoring module is used to monitor the pressure difference of the filter used online, said filter control module is used to control the filter to switch on and switch off the filter system, and said purge control module is used to control the blowback process of the filter.

12. The multiple-filter system according to claim 11 , wherein said online pressure difference monitoring module includes pressure gauge(s) or differential- pressure gauge(s) provided on an oil slurry inlet pipeline and a filtered oil outlet pipeline of each filter, said filter control module includes control valve(s) provided on the oil slurry inlet pipeline, the filtered oil outlet pipeline and a filter residue discharge pipeline of each filter, said purge control module includes control valve(s) provided on a purge medium inlet pipeline of each filter.

13. A multiple-stage filter system for the oil slurry filtration, which includes: (i) a primary filter unit and a secondary filter unit, or (ii) a primary filter unit and a tertiary filter unit, or (iii) a primary filter unit, a secondary filter unit and a tertiary filter unit;
wherein said primary filter unit includes a first filter system, said first filter system includes the oil slurry filter unit according to claim 8 ;
said secondary filter unit includes an automatic backwashing filter device having a driving means;
said tertiary filter unit includes a second filter system, said second filter system includes at least one filter;
the filtering precision of said secondary filter unit is less than the filtering precision of the primary filter unit, the filtering precision of said tertiary filter unit is less than the filtering precision of said primary filter unit and less than the filtering precision of said secondary filter unit;
wherein when the multiple-stage oil slurry filter system includes the primary filter unit and the secondary filter unit, a filtered oil outlet(s) of the primary filter unit is in communication with an inlet of the secondary filter unit; or
when the multiple-stage oil slurry filter system includes the primary filter unit and the tertiary filter unit, a filtered oil outlet(s) of the primary filter unit is in communication with an inlet of the tertiary filte

Assignees

• China Petroleum & Chem Corp
• Sinopec Res Inst Petroleum
• Sun Central Shanghai Marketing And Service Co Ltd

Inventors

• Hu Zhihai
• Han Yong
• Niu Chuanfeng
• Wang Lingping
• Liu Fa
• Chen Tan
• Shao Zhicai
• Xiao jinshan
• Deng Zhonghuo
• Li Shasha
• Dai Lishun
• Ye Wei
• Fang Qiang
• Xu Wenjing

Classifications

• B01D2239/1208

  Porosity · CPC title

• B01D2239/0613

  Woven · CPC title

• B01D2239/0208

  Single-component fibres · CPC title

• B01D2201/18

  Filters characterised by the openings or pores · CPC title

• B01D39/1623 Primary

  of synthetic origin · CPC title