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CN-122003484-A - Process for decontaminating petrochemical compositions obtained from chemical recycling of polymeric materials

CN122003484ACN 122003484 ACN122003484 ACN 122003484ACN-122003484-A

Abstract

The present invention relates to a process for decontamination of petrochemical compositions 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 a nitrogen bubbling treatment to obtain a product (C). Such a process allows for the purification of hydrocarbon compositions, such as pyrolysis oil products obtained from the processing of waste plastic compositions, such 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 method of decontaminating a petrochemical composition, the method 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 nitrogen bubbling treatment to obtain a product (C).
  2. 2. The process of claim 1 wherein the hydrocarbon composition a is a hydrocarbon-containing oil product obtained by decomposition of waste plastics.
  3. 3. The method of any one of claims 1-2, wherein hydrocarbon composition a comprises >200ppm and <600ppm of atomic chlorine as determined according to ASTM UOP 779-08.
  4. 4. A process according to any one of claims 1-3, wherein hydrocarbon composition a comprises: 25.0% or more and 95.0% or less, preferably 25.0% or more and 70.0% or less, more preferably 25.0% or more and 50.0% or less, by weight of normal paraffins, and/or Isoparaffin not less than 5.0 and not more than 20.0wt%, preferably not less than 5.0 and not more than 15.0wt%, more preferably not less than 7.5 and not more than 15.0wt%, and/or More than or equal to 5.0 and less than or equal to 50.0wt%, preferably more than or equal to 10.0 and less than or equal to 40.0wt%, more preferably more than or equal to 15.0 and less than or equal to 35.0wt%, more preferably more than or equal to 15.0 and less than or equal to 25.0wt% of olefins, and/or More than or equal to 5.0 and less than or equal to 20.0wt%, preferably more than or equal to 5.0 and less than or equal to 15.0wt%, more preferably more than or equal to 7.5 and less than or equal to 15.0wt% of cycloparaffin, and/or Aromatic compounds of 5.0% or more and 15.0% or less, preferably 5.0% or more and 12.5% or less, more preferably 7.5% or more and 12.5% or less, Relative to the total weight of hydrocarbon composition a.
  5. 5. The method according to any one of claims 1 to 4, wherein the water washing treatment is carried out at a temperature of not less than 10 ℃ and not more than 60 ℃.
  6. 6. The method according to any one of claims 1-5, wherein the water wash treatment comprises subjecting a composition comprising a hydrocarbon composition and water, preferably deionized water, to a mixing operation.
  7. 7. The process according to any one of claims 1 to 6, wherein in the water wash treatment step (i) the weight ratio of hydrocarbon composition a to water is from 10:1 to 1:10.
  8. 8. The method according to any one of claims 6-7, 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.
  9. 9. The process according to claims 6-8, wherein the mixing operation is followed by a settling period in which phase separation takes place to obtain an aqueous phase and a washed product B.
  10. 10. The process according to any one of claims 1-9, wherein step (ii) comprises passing a volume of nitrogen through a liquid, a quantity of the washed product B, and evacuating gas escaping from the liquid, in a vessel under agitation.
  11. 11. The process of claim 10, wherein step (ii) is performed at a temperature of ≡10 ℃ and ≡60 ℃.
  12. 12. The process according to any of claims 10-11, wherein nitrogen is supplied at a volumetric flow rate of >5.0 and <15.0 l/min per liter of washed product B for a period of >1 hour, preferably >2 and <5 hours.
  13. 13. The process according to any one of claims 1-12, wherein the process comprises a step of pyrolysis of the waste plastic composition prior to step (i), wherein the hydrocarbon composition a is obtained in the form of a liquid product from the pyrolysis.
  14. 14. The process according to claim 13, wherein the pyrolysis is subjected to a low severity pyrolysis process at a temperature of > 250 ℃ and < 450 ℃, preferably > 275 ℃ and < 425 ℃, more preferably > 300 ℃ and < 400 ℃, or to a high severity pyrolysis process at a temperature of > 450 ℃ and < 750 ℃, preferably > 500 ℃ and < 700 ℃, more preferably > 550 ℃ and < 650 ℃.
  15. 15. The method according to any one of claims 13-14, wherein the waste plastic composition comprises >40.0wt%, more preferably >50.0wt%, even more preferably >60.0wt% or >70.0wt% polyolefin.

Description

Process for decontaminating petrochemical compositions obtained from chemical recycling of polymeric materials Technical Field The present invention relates to a method for decontamination of petrochemical compositions. Background In the chemical and refinery industries, a wide variety 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 of the product. One particular aspect associated with such optimized production is the use of high quality feedstock (also referred to as feed) as an input material. A large number of such chemical and refinery processes utilize petrochemical compositions as feeds. A particularly desirable type of feed that is currently sought to be used in the chemical and refinery industries is one whose source can be found in the waste stream. The use of such a feed will greatly facilitate the recycling of the material and it is highly desirable to be able to use waste as a valuable feed for the new process. There is especially great interest in using materials derived from waste plastics as feed materials. This can be highly desirable in the petrochemical and refinery industries because waste plastics are primarily material streams containing a large proportion of molecules in which carbon and hydrogen constitute the majority of atoms. Thus, such materials have atomic compositions very similar to typical hydrocarbon materials conventionally used in the petrochemical and refinery industries. Thus, materials produced from waste plastics may be well suited for use in this industry. In recent years, in the field of converting waste plastic materials into feed streams that can be suitably used in petrochemical and refinery industries, technological development and industrial activities are increasing. For example, via techniques such as pyrolysis of plastic materials, waste plastic materials that are solid at room temperature may be converted into a hydrocarbon-containing stream that is liquid at such temperatures and thus may 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 production processes. Light olefins (e.g., ethylene and propylene) and aromatics (e.g., benzene) are well known as valuable building blocks commonly used in chemical product synthesis, especially in the synthesis of polymer products, the most abundant 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 feed stream are subjected to conditions that cause the atomic bonds to break and form smaller molecules. Such processes typically result in product compositions containing desirably high yields of light olefins and aromatics due to chemical reaction kinetics. After exiting the cracking unit, the product composition is typically subjected to one or more separation operations to obtain a high quality, high purity chemical stream that can be processed into the desired final product (e.g., polymeric material). Thus, when a feed stream derived from waste plastics is used in such cracking operations, it is possible to produce polymeric material from the waste polymeric material and thereby establish recycling of the polymer. It will be appreciated that this provides an attractive route for the synthesis of materials. 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 commercially performed in global scale operations and when process interruptions occur, large process efficiency losses can occur in terms of equipment downtime and off-grade products. Furthermore, cracking processes are very sensitive processes. The conditions must be maintained within strict specifications. This also has an effect on the feed materials that can be processed in such equipment. On the other hand, the waste plastic streams available for processing are typically not very consistent in their composition, and when they come from waste collection operations (whether consumer or industrial grade), the composition of such streams can be expected to vary considerably from batch to batch. This can conflict with the requirements of chemical processing operations for which they are useful as feed materials, which dictate a high level of consistency. Thus, there is a need to ensure that the products derived from waste plastics and which can be used