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Process for converting plastic into gases, liquid fuels and waxes by cracking

a technology of liquid fuels and cracking, which is applied in the direction of fuels, hydrocarbon oil treatment products, bio-feedstocks, etc., can solve the problems of reducing the quality of organic fractions of solid waste, reducing the density of condensate, and reducing the quality of organic fractions. , to achieve the effect of high quality, reduced density of condensate, and high density

Inactive Publication Date: 2019-11-14
SOLVAY SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The inventors have discovered a way to remove oxygenated compounds from a mixture of plastic and oxygenated compounds at a low temperature. They also found that the density of the gas stream formed during the process can be used as a marker to determine when the deoxygenation process is complete. If the density is high at the beginning of the process, it decreases as the oxygenated compounds are removed. When a certain density is reached, a high-quality product stream with low oxygen content is obtained. This patent is useful for removing oxygen from plastic to improve its quality and create better products.

Problems solved by technology

The present inventors found that available technologies have the drawback that oxygenated compounds being present in the raw material are in most cases detrimental as they increase the oxygen content in the obtained products thereby lowering their quality.
While this process allows for the reduction of oxygenated hydrocarbons, it has the drawback that the organic fraction of the solid waste first has to be pyrolyzed at high temperature.
At such high temperature, the plastic in the solid waste also depolymerizes and the depolymerization products can react with the oxygenized compounds resulting in an undesired high oxygen content of the obtained gases, liquid fuels and waxes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0066]The experiment was carried out following the general procedure described above. Experiments were carried out using 80 wt % HDPE and 20 wt % PP (pure plastic that does not contain oxygenated compounds for comparison in example 1.1 and plastic coming from a recycling plant and containing impurities such as paper, metal foil, etc. in examples 1.2 and 1.3) preheated at ca. 105° C. to remove moisture as raw materials and 20 g of an amorphous catalyst, namely SiO2. Catalyst to dry plastic mixture weight ratio was equal to 20 / 30 by wt. The results are summarized in Table 1 below.

example 2

[0067]The experiment was carried out following the general procedure described above. Experiments were carried out using 80 wt % HDPE and 20 wt % PP (coming from a recycling plant and containing impurities such as paper, metal foil, etc.) preheated at ca. 105° C. to remove moisture as raw materials and 20 g of a equilibrated Fluidized Catalytic Cracking Catalyst (ECATDC) provided by Equilibrium Catalyst Inc. Catalyst to dry plastic mixture weight ratio was equal to 20 / 30 by wt. Three mixtures of waste HDPE and PP were prepared and submitted for catalytic depolymerization (examples 2.1 and 2.2). The results are summarized in Table 1 below.

example 3

[0068]The experiment was carried out following the general procedure described above. Experiments were carried out using 80 wt % HDPE and 20 wt % PP (coming from a recycling plant and containing impurities such as paper, metal foil, etc.) preheated at ca. 105° C. to remove moisture as raw materials and 20 g of a bottom cracking additive catalyst BCA-105 provided by Johnson Matthey. Catalyst to dry plastic mixture weight ratio was equal to 20 / 30 by wt (example 3.1). The results are summarized in Table 1 below.

TABLE 1ReactionDensity of% H2OReactionTemper-timeMass produced during reaction time range (g)conden-removalExam-Sam-timeature / rangeHCOWaxessateat T pleple(min)° C.(min-min)GasesGasolineKeroseneDiesel(+C22)(+C20)H2OTOTAL[g / cm3]425° C.1.1#030.5200-425   0-30.50.140.150.110.050.020.030.480.782#125425 0-250.721.891.380.670.250.354.910.782#24042525-400.270.710.780.640.040.102.440.786#36042540-600.441.101.371.320.090.244.320.790#49042560-900.661.682.293.981.712.7810.300.8221.2#056RT-4...

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Abstract

The present invention relates to a process for converting a mixture comprising plastic and at least one oxygenated compound into gases, liquid fuels and waxes by cracking. The process comprises a deoxygenation step and subsequently a cracking step during which the mixture is subjected to cracking conditions for obtaining a product stream containing said gases, liquid fuels and waxes.

Description

[0001]This application claims priority to European application No. EP 16306634.3 filed on Dec. 7, 2016, the whole content of this application being incorporated herein by reference for all purposes.TECHNICAL FIELD[0002]The present invention relates to a process for converting a mixture comprising plastic and at least one oxygenated compound into gases, liquid fuels and waxes by cracking. The process comprises a deoxygenation step and subsequently a cracking step during which the mixture is subjected to cracking conditions for obtaining a product stream containing said gases, liquid fuels and waxes.PRIOR ART[0003]In view of the increasing importance of polymers as substitutes for conventional materials of construction, such as glass, metal, paper and wood, the perceived need to safe non-renewable resources such as petroleum and dwindling amounts of landfilled capacity available for the disposal of waste products, considerable attention has been devoted in recent years to the problem ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10G1/10C10G11/02C10G3/00C10G1/00C10L1/06C10L1/08
CPCC10L2270/023C10L1/08C10G1/10C10L2270/026C10G2300/202C10G2400/04C10G1/002C10G2400/08C10L2200/0469C10G3/44C10L1/06C10L2270/04C10G11/02C10L2290/54C10G2400/02C10G2300/1003Y02P30/20C10G11/05
Inventor STREIFF, STÉPHANEBALTHASART, DOMINIQUEPICCININI, MARCOCORMA, AVELINOCERRO-ALARCÓN, MIRIAMMENGUAL, JESÚS
Owner SOLVAY SA