CN103450939A - Method for extraction of crude phenol by medium and low temperature coal tar delayed coking device - Google Patents

Abstract

The invention relates to a method for extraction of crude phenol by a medium and low temperature coal tar delayed coking device. The method includes: subjecting medium and low temperature coal tar to heat transfer to 260-300DEG C, then bringing it into a coal tar stripping tower, dividing the coal tar into stripping tower overhead gas and heavy fraction, letting the coal tar stripping tower overhead gas enter a fractionating tower to undergo secondary separation; mixing the heavy fraction with coking cycle oil, making the mixture enter a heating furnace, raising the temperature to 400-500DEG C, then bringing it into a coke tower to undergo pyrolysis and condensation reactions so as to generate oil gas and coke; letting the oil gas enter the lower section of the fractionating tower to undergo heat and mass transfer with distillate oil in the tower, and fractionating rich gas, gasoline, phenol oil, diesel oil, wax oil and cycle oil fraction; subjecting the phenol oil to dephenolization treatment so as to obtain crude phenol and dephenolized oil; and subjecting the dephenolized oil, the gasoline, the diesel oil and light wax oil to mixing and hydrogenation, thus obtaining hydrogenated naphtha and hydrogenated diesel oil. The method not only can convert coal tar totally into light gasoline and diesel oil as well as high quality petroleum coke, but also can extract crude phenol oil with high added value.

Description

A kind of middle coalite tar delayed coking unit extracts the method for crude phenols

Technical field

The present invention relates to a kind of method that middle coalite tar delayed coking unit extracts crude phenols, belong to coal tar processing and utilize field.

Background technology

China is that an oil and natural gas resource is less, and the relatively abundant country of coal resources.Along with the shortage of petroleum resources and the arrival of Waste Era of Oil, some price of chemical products that obtained by petrochemical complex also will significantly rise, and these Chemicals too can be from coal gasification, in the products such as destructive distillation, directly or indirectly obtain, utilize advanced coal conversion technology, the development Modern Coal-based Chemical, produce gasoline, diesel oil and Chemicals, not only to the chemical industry industry restructuring, lifting industry energy level has the effect of actively promoting, 21 century alleviates China to the petroleum import interdependency especially, develop a circular economy, environmental contamination reduction, ensure the strategic measure of Chinese energy safety and sustainable economic development.

Middle coalite tar be coal under 600～1000 ℃ of temperature condition, in destructive distillation and gasification, obtain there is pungent odour, be black or the thick liquid product of chocolate, composition is extremely complicated, multiple compounds up to ten thousand are arranged, that can identify out at present has a kind more than 500, and wherein the content of phenolic compound accounts for 10%～30%.Phenolic compound is important industrial chemicals, therefore at aspects such as synthon, engineering plastics, agricultural chemicals, medicine, explosive, softening agent, sanitas, spices and dyestuff intermediates, purposes is widely arranged, therefrom reclaiming phenol in coalite tar has good economic benefit.

The method of extracting crude phenols in current therefrom coalite tar mainly contains: settling methods, rectification method, solvent extration, the precipitator method etc.These processing modes are the simple crude phenols that extract from coal tar just, and the working depth of coal tar is inadequate, and overall economic benefit is not high.Chinese patent CN101633848A discloses a kind of middle coalite tar deep processing method, comprise the following steps: at first coal tar is carried out to fractionation, obtain lighting end, carbolic oil, last running and de-tail pitch, then carbolic oil is carried out to phenol removal, obtain phenol products and dephenolize oil, then dephenolize oil, lighting end and last running are carried out to hydrogenation reaction jointly, obtain dry gas, liquefied gas, hydrotreated naphtha and hydrogenated diesel oil, finally hydrotreated naphtha is carried out to catalytic reforming-Aromatics Extractive Project, obtain benzene,toluene,xylene and solvent oil.The contriver thinks that this technique patent has following shortcoming and defect after analyzing: the de-tail pitch that accounts for coal tar 30m% does not effectively carry out processing and utilization, causes the wasting of resources, and the utilization ratio of coal tar is lower, and economic benefit has limitation; This technical process complexity, mainly used hydrogenation unit simultaneously, and investment is large, the cycle of operation is short.

Summary of the invention

The purpose of this invention is to provide a kind of method that middle coalite tar delayed coking unit extracts crude phenols, the method not only can all transform lightweight petrol and diesel oil and high-quality petroleum coke by coal tar, and can extract crude phenols.The method technical process is simple, and operational condition relaxes, and gained lightweight petrol and diesel oil further hydrogenation obtains clean fuel oil.

A kind of middle coalite tar delayed coking unit of the present invention extracts the method for crude phenols, and the technical scheme of taking is:

A) after the middle coalite tar motion device come from tank field with after separation column sideline product heat exchange to 260～300 ℃, enter the top of coal tar stripping tower, the stripping tower bottom passes into stripped vapor and reaches the turning oil from separation column, coal tar is partitioned into stripping tower top gas and last running in stripping tower, and coal tar stripping tower top gas enters the middle part of separation column and carries out secondary separation;

B) last running after the coal tar stripping and coking recycle oil fully mix in the stripping tower bottom and enter process furnace by the extraction of radiation fresh feed pump and be rapidly heated to 400～500 ℃, then enter coke drum, carry out cracking and condensation reaction in coke drum, generate oil gas and coke;

The high-temperature oil gas of c) overflowing from top of coke tower enters the separation column hypomere, at Ta Nei and each distillate is conducted heat and mass transfer, fractionates out rich gas, gasoline, carbolic oil, diesel oil, wax oil and cycle oil fraction;

D) carbolic oil is carried out to phenol removal, obtain crude phenols and dephenolize oil;

E) will after dephenolize oil, gasoline, diesel oil and light wax oil mixed hydrogenation, obtain hydrotreated naphtha and hydrogenated diesel oil.

This working method not only can all transform lightweight petrol and diesel oil and high-quality petroleum coke by coal tar, and can extract the crude phenols oil with high added value.

The accompanying drawing explanation

Extract the method for crude phenols in a kind of therefrom warm delay coking of coal tar process of Fig. 1

Embodiment

After certain coal-tar middle oil motion device, through after interchanger A heat exchange to 260～300 ℃, enter in coal tar stripping tower B, the stripping tower bottom passes into stripped vapor 3 and turning oil 12, stripping tower top light petroleum gas 4 enters in separation column E and carries out secondary separation, coal tar heavy fractioning after stripping and turning oil mixture 5 enter process furnace C and quickly heat up to 400～500 ℃, heated mixt 6 enters coke drum D, carry out cracking and condensation reaction in coke drum, generate oil gas 7 and coke 13, oil gas 7 enters separation column E, fractionate out separation column top gas 8 in separation column, carbolic oil 9, diesel oil 10 and wax oil 11, overhead gas 8 enters fractionation tower top triphase separator I and obtains rich gas 16 and gasoline 17, carbolic oil 9 obtains crude phenols 14 and dephenolize oil 15 after dephenolize device G, and dephenolize oil 15, gasoline 17, diesel oil 10 and wax oil 11 are entered to hydrogenation unit H, obtains hydrotreated naphtha 18 and hydrogenated diesel oil 19 after mixed hydrogenation.

Claims (1)

1. the coalite tar delayed coking unit extracts the method for crude phenols in one kind, it is characterized in that:

A) after the middle coalite tar motion device come from tank field with after separation column sideline product heat exchange to 260～300 ℃, enter the top of coal tar stripping tower, coal tar stripping tower bottom passes into stripped vapor and reaches the turning oil from separation column, coal tar is partitioned into stripping tower top gas and last running in stripping tower, and coal tar stripping tower top gas enters the middle part of separation column and carries out secondary separation;

B) last running after the coal tar stripping and coking recycle oil fully mix in the stripping tower bottom and enter process furnace by the extraction of radiation fresh feed pump and be rapidly heated to 400～500 ℃, then enter coke drum, carry out cracking and condensation reaction in coke drum, generate oil gas and coke;

The high-temperature oil gas of c) overflowing from top of coke tower enters the separation column hypomere, at Ta Nei and each distillate is conducted heat and mass transfer, fractionates out rich gas, gasoline, carbolic oil, diesel oil, wax oil and cycle oil fraction;

D) carbolic oil is carried out to phenol removal, obtain crude phenols and dephenolize oil;

E) will after dephenolize oil, gasoline, diesel oil and light wax oil mixed hydrogenation, obtain hydrotreated naphtha and hydrogenated diesel oil.

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