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CN-122003483-A - Process for decontamination of petrochemical compositions obtained from chemical recycling of polymeric materials

CN122003483ACN 122003483 ACN122003483 ACN 122003483ACN-122003483-A

Abstract

The present invention relates to a decontamination process for petrochemical compositions, which process comprises subjecting a hydrocarbon composition (a) comprising inorganic and/or polar contaminants to (i) a water wash treatment and (ii) an adsorption treatment, preferably wherein the inorganic and/or polar contaminants are chlorine-containing contaminants. Such a process allows for the purification of hydrocarbon compositions, such as pyrolysis oil products obtained from the processing of waste plastic compositions, so that such hydrocarbon compositions may be suitable for processing in petrochemical and/or refinery operations.

Inventors

  • F. Cook
  • HUANG KAIXIN
  • A. C. Aka
  • R. Aresa

Assignees

  • SABIC环球技术有限责任公司
  • 沙特阿拉伯石油公司

Dates

Publication Date
20260508
Application Date
20241011
Priority Date
20231013

Claims (15)

  1. 1. A decontamination process for petrochemical compositions, the process comprising subjecting a hydrocarbon composition (a) comprising inorganic and/or polar contaminants to the steps of: (i) Water washing treatment, and (Ii) The adsorption treatment is carried out, Preferably wherein the inorganic and/or polar contaminants are chlorine-containing contaminants.
  2. 2. The method according to claim 1, comprising the steps of: (i) Subjecting a hydrocarbon composition (A) comprising inorganic and/or polar contaminants to a water wash treatment, preferably wherein the inorganic and/or polar contaminants are chlorine-containing contaminants, to obtain a washed product (B), and (Ii) Subjecting the product (B) obtained from step (i) to an adsorption treatment to obtain a product (C).
  3. 3. The process according to any one of claims 1-2, wherein the hydrocarbon composition a is a hydrocarbon-containing oil product obtained by decomposition of waste plastics.
  4. 4. A process according to any one of claims 1-3, wherein the hydrocarbon composition a comprises >200ppm and <600ppm of atomic chlorine, as determined according to ASTM UOP 779-08.
  5. 5. The method of any one of claims 1-4, wherein the hydrocarbon composition a comprises, relative to the total weight of the hydrocarbon composition a: 25.0% by weight or more and 95.0% by weight or less, preferably 25.0% by weight or more and 70.0% by weight or less, more preferably 25.0% by weight or more and 50.0% by weight or less, of normal paraffins, and/or Equal to or greater than 5.0 and equal to or less than 20.0 wt%, preferably equal to or greater than 5.0 and equal to or less than 15.0 wt%, more preferably equal to or greater than 7.5 and equal to or less than 15.0 wt% isoparaffin, and/or More preferably more than or equal to 5.0 and less than or equal to 50.0 wt%, more preferably more than or equal to 10.0 and less than or equal to 40.0 wt%, more preferably more than or equal to 15.0 and less than or equal to 35.0 wt%, more preferably more than or equal to 15.0 and less than or equal to 25.0 wt% of olefins, and/or More preferably more than or equal to 5.0 and less than or equal to 20.0 wt%, more preferably more than or equal to 5.0 and less than or equal to 15.0 wt%, more preferably more than or equal to 7.5 and less than or equal to 15.0 wt% of cycloalkanes, and/or Aromatic hydrocarbon of 5.0% by weight or more and 15.0% by weight or less, preferably 5.0% by weight or more and 12.5% by weight or less, more preferably 7.5% by weight or more and 12.5% by weight or less.
  6. 6. The method of any one of claims 1-5, wherein the water wash treatment is performed at a temperature of ≡10 ℃ and ≡60 ℃.
  7. 7. The method according to any one of claims 1-6, wherein the water wash treatment comprises subjecting a composition comprising the hydrocarbon composition and water, preferably deionized water, to a mixing operation.
  8. 8. The process of any one of claims 1-7, wherein in the water wash treatment step (i) the weight ratio of hydrocarbon composition a to water is from 10:1 to 1:10.
  9. 9. The method according to any one of claims 7-8, wherein the mixing operation is performed by stirring for a period of time not less than 5 minutes, preferably not less than 5 and not more than 60 minutes.
  10. 10. The process according to claims 7-9, wherein the mixing operation is followed by a settling period, wherein phase separation occurs to obtain an aqueous phase and a washed product B.
  11. 11. The process according to any one of claims 1-10, wherein step (ii) comprises supplying an amount of adsorbent to washed product B, preferably wherein the adsorbent is supplied in an amount of ≡1.0 and ≡10.0 wt% relative to the weight of the washed product B.
  12. 12. The process according to claim 11, wherein the adsorbent is selected from alumina, silica and zeolite adsorbents, preferably the adsorbent is a Ce atom containing zeolite beta.
  13. 13. The process according to any one of claims 11-12, wherein the step (ii) comprises a first step of mixing the washed product B with the adsorbent, preferably for >0.5 and <10 hours, followed by a separation step, preferably by centrifugation, to remove the adsorbent and obtain the product C.
  14. 14. The process according to any one of claims 1-13, wherein the process comprises a step of pyrolysis of a waste plastic composition prior to step (i), preferably wherein the waste plastic composition comprises >40.0 wt%, more preferably >50.0 wt%, even more preferably >60.0 wt% or >70.0 wt% of a polyolefin, wherein hydrocarbon composition a is obtained as a liquid product from the pyrolysis.
  15. 15. The process according to claim 14, wherein the pyrolysis is carried out in a low severity pyrolysis process at a temperature of > 250 ℃ and < 450 ℃, preferably > 275 ℃ and < 425 ℃, more preferably > 300 ℃ and < 400 ℃, or in a high severity pyrolysis process at a temperature of > 450 ℃ and < 750 ℃, preferably > 500 ℃ and < 700 ℃, more preferably > 550 ℃ and < 650 ℃.

Description

Process for decontamination of petrochemical compositions obtained from chemical recycling of polymeric materials Technical Field The present invention relates to a method for decontaminating petrochemical compositions. Background In the chemical and refinery industries, a series of chemical conversion processes are operated. These processes are highly optimized in terms of productivity, efficiency and sustainability to achieve economical and profitable operation and high quality products. A particular aspect with respect to such an optimized production consists in using high quality raw materials, also called raw materials, as input materials. Many such chemical and refinery processes utilize petrochemical compositions as feedstock. A particularly desirable type of feedstock currently sought for use in the chemical and refinery industries is one from which its source is found in the waste stream. The use of such materials would greatly facilitate the recycling of the materials, and it would be highly desirable to be able to utilize waste materials as valuable materials for the new process. In particular, there is a great interest in using materials derived from waste plastics as raw materials. This may be quite desirable in the petrochemical and refinery industries because waste plastics are predominantly material streams containing a large proportion of molecules in which carbon and hydrogen constitute the major proportion of atoms. Thus, the atomic composition of such materials is very similar to typical hydrocarbon materials conventionally used in the petrochemical and refinery industries. Therefore, materials produced from waste plastics are well suited for use in the industry. In recent years, there has been an increase in technical development and industrial activity in the field of converting waste plastic materials into a feed stream applicable to petrochemical and refinery industries. For example, waste plastic materials that are solid at room temperature can be converted to hydrocarbon-containing streams that are liquid at such temperatures by techniques such as pyrolysis of plastic materials, and thus can be processed in chemical and refinery processes equipped for converting liquid hydrocarbons. Such products obtained from pyrolysis of waste plastic materials may be referred to as plastic-derived oils. Typical examples of such processes include light olefin and aromatic hydrocarbon production processes. Light olefins such as ethylene and propylene and aromatics such as benzene are well known valuable building blocks that are commonly used in the synthesis of chemical products, particularly polymer products, the most abundant examples of which are polyethylene and polypropylene. The most widely used process for the production of light olefins and aromatics is the so-called cracking operation, typically a thermal or catalytic cracking operation. In such cracking operations, hydrocarbon molecules (which typically have fossil hydrocarbon properties) present in the raw material stream are subjected to conditions that break the atomic bonds and form smaller molecules. Due to the kinetics of chemical reactions, such processes typically result in a product composition comprising the desired high quality light olefins and aromatics. After leaving the cracking unit, the product composition is typically subjected to one or more separation operations to obtain a high quality, high purity chemical stream, which can be processed into the desired end product, e.g., into a polymeric material. Thus, when a feed stream derived from waste plastics is used in such cracking operations, polymeric material may be produced from the waste polymeric material and thus establish recycling of the polymer. It will be appreciated that this presents an attractive route for material synthesis. In order for waste plastic materials to be suitable for processing in chemical operations such as thermal or catalytic cracking operations, the product must meet very stringent material specifications. Cracking operations are performed commercially in world-scale operations and when process interruptions occur, significant loss of process efficiency occurs in terms of plant downtime and off-grade products. Furthermore, the cracking process is a very sensitive process. The conditions must be kept within strict specifications. This also has an effect on the feedstock materials that can be processed in such devices. On the other hand, waste plastic streams available for processing are typically not very consistent in terms of their composition, and as they emerge from waste collection operations, whether at the consumer or industrial level, the composition of such streams can be expected to vary considerably from one batch to the next. This can conflict with the requirements of chemical processing operations for which they can act as feedstock materials, requiring a high level of consistency. Thus, there is a need to ensure that products de