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Process to make a sulphur containing steam cracker feedstock

A cracker and steam technology, which is applied in chemical instruments and methods, preparation of liquid hydrocarbon mixtures, catalytic conversion of impurities, gas purification, etc., to achieve the effect of saving oil depot facilities and increasing volume

Inactive Publication Date: 2005-08-03
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The method of WO-A-9937736 has the disadvantage that an additional hydrotreatment unit is required

Method used

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  • Process to make a sulphur containing steam cracker feedstock

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Embodiment Construction

[0016] Step (a) can be carried out according to well-known methods. Typically, natural gas is obtained from underground wells. After the gas reaches the surface, gaseous hydrocarbons of 1-5 carbon atoms are typically combined with C 5 + Hydrocarbon separation, for example in so-called slug traps. The resulting liquid product is also known as oilfield condensate and may have very high sulfur levels, for example above 1500 ppm, or even above 1900 ppm. A typical lower level is 1000 ppm sulfur. Natural gas from which oilfield condensates have been separated is called pre-cleaned natural gas.

[0017] This liquid condensate obtained from step (a) may have a very high final boiling point, even above 300°C, but at the same time most of the product boils below 300°C. Separation of the high boiling fraction, preferably by eg a flashing step or a distillation step, results in a low boiling fraction comprising sulfur compounds and meeting the boiling range requirements for use as ste...

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Abstract

The method for producing a sulfur-containing steam cracker feedstock from a crude natural gas comprises the steps of (a) separating a sulfur-containing liquid gas field condensate fraction from a crude natural gas, (b) dividing the liquid gas field condensate into a high-boiling fraction and a low-boiling fraction, (c) producing a carbon monoxide / hydrogen mixture from the gas obtained from step (a), (d) producing a paraffin product by performing a Fischer-Tropsch reaction by using the carbon monoxide and the hydrogen from step (c), and (e) obtaining the sulfur-containing steam cracker feedstock of a sulfur content of 50 to 1,000 ppm by blending at least part of the paraffin product with the low-boiling fraction obtained in step (b).

Description

technical field [0001] The present invention relates to a process for preparing a sour steam cracker feedstock from a natural gas feedstock by combining a Fischer-Tropsch obtained paraffinic feedstock with a sour feedstock from another source. Background technique [0002] Those skilled in the art of the steam cracker process are well aware that adding sulfur to the feedstock can reduce coke formation. Coke formation in steam cracker tubes is mainly by two mechanisms, namely pyrolysis reaction and catalytic dehydrogenation reaction. Pyrolysis reactions are minimized by using low operating pressures, having high steam to hydrocarbon ratios of the order of 30% to 60%, and avoiding excessive metal tube temperatures and avoiding unvaporized feedstock entering high temperature regions. To withstand high tube metal temperatures up to 2100°F, high nickel and chromium containing alloys are used, such as alloys containing 35% nickel and 25% chromium. These metals catalyze dehydroge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/38C07C1/04C07C11/02C10G2/00C10G5/00C10G5/06C10G7/00C10G45/02C10K1/00C10L3/10
CPCC10G2/32C10G45/02C10K1/34C10L3/10C10L2230/14C10L2290/06C10L2290/42
Inventor G·J·范赫尔林根A·S·艾德鲁斯
Owner SHELL INT RES MAATSCHAPPIJ BV
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