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Steam cracking process

a cracking process and steam technology, applied in the field of olefin production, can solve the problems of reducing the run-length of the cracker, contaminating other materials, and high-quality feedstocks

Inactive Publication Date: 2011-03-31
LYONDELL CHEM TECH LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a process for making olefins and other products from steam cracking. The process involves using a solid adsorbent to treat a hydrocarbon feed, which reduces the buildup of material in the process. This results in higher yields of desired products.

Problems solved by technology

However, such feeds contain high molecular weight, non-volatile, heavy components that accumulate as coke in the convection section of the pyrolysis furnace, which reduces the run-length of the cracker.
During transport, it is not uncommon for the high-quality feedstocks (i.e., is naphthas and other light volatile hydrocarbons) to become contaminated with other materials containing non-volatile components such as crude oil.
Such non-volatile components can cause problems for conventional pyrolysis furnaces.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

n In Batch Test

[0045]Alba condensate (78 g) is mixed with K10 montmorillonite clay powder (Aldrich, 7.8 g) in a 250-mL Erlenmeyer flask. The slurry is stirred with a magnetic stirrer bar for 24 h at ambient temperature (approximately 75 F). The mixture is filtered. The color of the filtrate is measured according to ASTM D1500 method. The results are presented in Table 1.

[0046]The above test is repeated with the following adsorbents: Westvaco Nuchar® activated carbon powder (General Filtration, Ontario, Canada), KSF montmorillonite clay powder (Aldrich).

[0047]Significant reduction in color is seen in each test. A change in color indicates that certain moieties had been removed from the condensate by each of these absorbents.

TABLE 1ColorSampleASTM D1500Untreated Alba condensate3.5Treated with K10 montmorillonite clay powder0.3Treated with Westvaco Nuchar ® carbon0.2Treated with KSF montmorillonite clay powder2.3

example 2

est

[0048]Alba condensate (780 g) and Calgon CAL® 12×40 (0.78 g) is mixed in a 2-L Erlenmeyer flask. The mixture is stirred with a magnetic stirrer bar for 24 h at ambient temperature. The color of the filtrate is measured.

[0049]The filtrate is fed at a rate of 0.2 mL / min co-currently with nitrogen (0.125 standard liters per minute) into an Inconel (600 HT) tube (ID ¼″, length 12″) maintained at 1000 F with an electric heater. The test is terminated after 6 h. The tube is weighed after it is cooled to room temperature. The amount of deposit is 3.6 mg. The amount of deposit is confirmed by decoking the tube by flowing air to the tube at 1500 F to burn the deposit and measuring the amount of carbon dioxide and carbon monoxide collected. The fouling test is used to simulate the fouling in the convection section of a steam cracker.

[0050]The above procedure is repeated except that 3.92 g Calgon CAL® 12×40 activated carbon is used. The amount of deposit is 2.1 mg. The fouling test is repea...

example 3

Adsorption

[0052]A cylindrical absorption vessel is charged with Calgon CAL® 12×40 activated carbon (63.9 g) to form a bed 3″ high and 2″ in diameter. The vessel is filled with a Bejaia condensate to wet the carbon. Bejaia condensate is fed to the vessel (down flow) at a rate of 234 g / h. A back-pressure regulator is used to maintain 20 psig pressure in the vessel. The test is conducted at ambient temperature (approximately 75° F.). Samples are collected during at various times.

[0053]The fouling test procedure described in Example 2 is repeated with samples collected from the above fixed-bed test. The results are shown in Table 3. The data show that the activated carbon is effective in reducing the color and fouling of Bejaia condensate.

TABLE 3SampleColorDeposit(Hours on stream)ASTM D1500(mg)Untreated Feed2.22.9 30.20.31310.61.02241.01.8

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Abstract

A steam cracking process is disclosed. The process comprises contacting a liquid hydrocarbon feed with a solid adsorbent to produce a treated feed and cracking the treated feed in a steam cracker to produce olefins and other hydrocarbon products. The process reduces coking in the convection tubes and extends the run length of the cracker.

Description

FIELD OF THE INVENTION[0001]This invention relates to the production of olefins by cracking a hydrocarbon feed. More particularly, this invention relates to contacting the feed with a solid adsorbent prior to cracking to reduce coke formation in a steam cracker.BACKGROUND OF THE INVENTION[0002]Steam cracking of hydrocarbons is a non-catalytic petrochemical process that is widely used to produce olefins such as ethylene, propylene, butenes, butadiene, and aromatics such as benzene, toluene, and xylenes (“Ethylene,” in Kirk-Othmer Encyclopedia of Chemical Technology, online edition, 2009).[0003]Basically, a hydrocarbon feed such as naphtha, gas oil, or other hydrocarbon is fractions is mixed with steam which serves as a diluent to keep the hydrocarbon molecules separated. The steam / hydrocarbon mixture is preheated to from about 900 to about 1,000 F, and then enters the reaction zone where it is very quickly heated to a severe hydrocarbon thermal cracking temperature in the range of fr...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10G11/00
CPCC10G9/36C10G25/003C10G25/03C10G2300/807C10G2300/1033C10G2400/20C10G55/04
Inventor CYBULSKIS, VIKTOR J.WEBBER, KENNETH M.
Owner LYONDELL CHEM TECH LP
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