Device and method for recovering disulfide from condensate oil desulfurized alcohol and alkali liquor

Abstract

The invention relates to a device for recovering disulfide from condensate oil desulfurized alcohol and alkali liquor, which comprises a desulfurized alcohol treatment unit, wherein a bottom end outlet of the desulfurized alcohol treatment unit is communicated with a bottom end inlet of an alkali liquor oxidization and sulfur dioxide separation unit; a bottom end outlet of the alkali liquor oxidization and sulfur dioxide separation unit is communicated with a side end inlet of an alkali liquor gas stripping column; a top end outlet of the alkali liquor oxidization and sulfur dioxide separation unit and a top end outlet of the alkali liquor gas stripping column are respectively communicated with a side end inlet of an exhaust water washing dealkalization tank; a side end outlet of the alkali liquor oxidization and sulfur dioxide separation unit and a bottom end outlet of the exhaust water washing dealkalization tank are respectively communicated with a top end inlet of a disulfide tank; a bottom end outlet of the alkali liquor gas stripping column is communicated with a side end inlet of the desulfurized alcohol treatment unit; and the device also comprises one or a plurality of filters connected in the components above, a plurality of circulating pumps, a plurality of pipelines, a plurality of liquid inlets and a plurality of liquid outlets.

Description

technical field [0001] The invention relates to condensate oil treatment equipment, in particular to a device and method for sweetening condensate oil and regenerating lye to recover disulfide. Background technique [0002] Condensate oil with a distillation range of 30°C-210°C generally contains a small amount of H 2 S, and hundreds or even thousands of ppm of sulfides, mercaptans, thiophenes and other sulfides, among which the mercaptan content accounts for more than 70% of the total sulfur, and the carbon three and below mercaptans account for more than 80% of the total mercaptans , and due to the strong toxicity, volatility, corrosiveness and disgusting odor of mercaptans, the corrosion of condensate oil processing equipment is serious, and at the same time, it has a great impact on environmental pollution. [0003] At present, for the processing of condensate oil, some refineries adopt the method of direct fractionation to obtain the products of each fraction, and then...

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Problems solved by technology

[0002] Condensate oil with a distillation range of 30°C-210°C generally contains a small amount of H 2 S, and hundreds or even thousands of ppm of sulfides, mercaptans, thiophenes and other sulfides, among which the mercaptan content accounts for more than 70% of the total sulfur, and the carbon three and below mercaptans account for more than 80% of the total mercaptans , and due to the strong toxicity, volatility, corrosiveness and disgusting odor of mercaptans, the corrosion of condensate oil processing equipment is serious, and at the same time, it has a great impact on environmental pollution

[0003] At present, for the processing of condensate oil, some refineries adopt the method of direct fractionation to obtain the products of each fraction, and then desulfurize the products of each fraction to meet the product quality requirements. The cost is high, and it is not conducive to the long-term stable operation of the device

The existing devices and treatment methods have the following disadvantages: the raw material entrains water to dilute the sweetened lye, causing a large amount of alkali slag consumption and alkali slag discharge, and there are still some highly toxic and corrosive odorous sulfides in the treated materials. Severe corrosion of lye on downstream condensate processing equipment and other issues

Some refineries adopt the method of hydrodesulfurization of condensate raw materials first. Although the problem of severe corrosion of the fractionation unit is solved, the investment in the hydrogenation unit is huge, which increases the cost of desulfurization

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