Product preparation system taking medium-temperature coal tar as raw material

Abstract

The utility model relates to the technical field of chemical treatment, in particular to a product preparation system taking medium-temperature coal tar as a raw material. Comprising a delayed coking device, a first fractionation device, a hydrofining device, a second fractionation device, a hydrogenation dearomatization device, an extractive distillation device and a distillation device. The hydrogenation dearomatization device is used for carrying out hydrogenation dearomatization treatment on the naphtha fraction, and the produced dearomatized oil is used as a feed of the extractive distillation device and enters a feed port of the extractive distillation device from a discharge port of the hydrogenation dearomatization device; and the rectification device is used for further separating the cycloalkane component into products such as cyclohexane and methyl cyclohexane.

Description

TECHNICAL FIELD

[0001] The utility model relates to a chemical processing technical field, concretely relates to a product preparation system with medium temperature coal tar as raw material. BACKGROUND

[0002] The medium temperature coal tar can produce naphtha fraction and diesel fraction after delayed coking, hydrorefining and hydrocracking, realizes the lightening of medium temperature coal tar, and produces more diesel fraction.

[0003] The main products of the lightening of the medium temperature coal tar are naphtha fraction and diesel fraction, and the proportion of the diesel fraction is more than 75%, but the naphtha fraction is not further treated, and the economic benefit of the product is low. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model provides a product preparation system with medium temperature coal tar as raw material to solve the problems of lacking further treatment of naphtha fraction and not separating and purifying naphthalene component.

[0005] The utility model provides a product preparation system with medium temperature coal tar as raw material, which comprises a delayed coking device, a first fractionating device, a hydrorefining device, a second fractionating device, a hydrodearomatization device, an extractive rectification device and a rectification device.

[0006] The oil gas outlet of the delayed coking device is connected with the feed inlet of the first fractionating device, the mixed fraction oil outlet of the first fractionating device is connected with the feed inlet of the hydrorefining device, the outlet of the hydrorefining device is connected with the feed inlet of the second fractionating device, the naphtha fraction outlet of the second fractionating device is connected with the feed inlet of the hydrodearomatization device, the outlet of the hydrodearomatization device is connected with the feed inlet of the extractive rectification device, the naphthalene component outlet of the extractive rectification device is connected with the feed inlet of the rectification device, and the rectification device has a naphthalene outlet.

[0007] The delayed coking device is used for lightening treatment of the medium temperature coal tar, removing heavy components such as colloid pitch and mechanical impurities, and improving the liquid product yield. The coking oil gas output by the oil gas discharge port enters the feed inlet of the first fractionating device. The first fractionating device is used for separating the oxygen-containing compounds in the coking oil gas, and the separated oxygen-containing compounds are used as raw materials for phenol extraction and provide suitable raw materials for hydrogenation. The mixed distillate oil output by the mixed distillate oil discharge port enters the feed inlet of the hydrogenation device. The hydrogenation device is used for removing O, S, N heteroatoms and trace metal elements contained in the mixed distillate oil, and hydrogenating and saturating part of the unsaturated hydrocarbons. The hydrogenation cracking device is used for lightening treatment of the tail oil fraction. The hydrogenation cracking oil mixture output by the hydrogenation device is used as the feed of the second fractionating device, and enters the feed inlet of the second fractionating device. The second fractionating device is used for separating the hydrogenation and hydrogenation cracking products into naphtha fraction, diesel fraction and tail oil fraction. The naphtha fraction output by the naphtha fraction discharge port enters the feed inlet of the hydrogenation de-aromatics device. The hydrogenation de-aromatics device is used for hydrogenation de-aromatics treatment of the naphtha fraction. The de-aromatics oil output by the hydrogenation de-aromatics device is used as the feed of the extractive distillation device, and enters the feed inlet of the extractive distillation device. The extractive distillation device is used for further separating the naphthene components into cyclohexane, methylcyclohexane and other products.

[0008] In an alternative embodiment, the first fractionating device further comprises a phenol oil discharge port and a bottom oil discharge port. The phenol oil output by the first fractionating device is collected or transmitted through the phenol oil discharge port, and the bottom oil output by the first fractionating device is collected or transmitted through the bottom oil discharge port.

[0009] In an alternative embodiment, the bottom oil discharge port is connected with the feed inlet of the delayed coking device. The bottom oil is mixed with the medium temperature coal tar and used as the feed of the delayed coking device.

[0010] In an alternative embodiment, the delayed coking device further comprises a coking outlet. The heavy components of the medium temperature coal tar are converted into pitch coke products after entering the delayed coking device, and the pitch coke products can be collected or transmitted through the coking outlet.

[0011] In an alternative embodiment, the second fractionating device further comprises a diesel fraction discharge port and a tail oil fraction discharge port. The diesel fraction output by the second fractionating device is collected or transmitted through the diesel fraction discharge port, and the tail oil fraction output by the second fractionating device is collected or transmitted through the tail oil fraction discharge port.

[0012] In an alternative embodiment, the process further comprises:

[0013] A hydrocracking unit, an inlet of the hydrocracking unit is connected with the tail oil fraction outlet, and an outlet of the hydrocracking unit is connected with an inlet of the second fractionating unit. The hydrocracking unit can be used to treat the tail oil fraction of the second fractionating unit, i.e. to perform hydrocracking treatment, and then the hydrocracking product can be mixed with the hydrofining product and then fed into the second fractionating unit.

[0014] In an alternative embodiment, the extractive rectification unit further comprises a paraffin component outlet. The paraffin component produced by the extractive rectification unit can be collected or transported through the paraffin component outlet.

[0015] In an alternative embodiment, the rectification unit further comprises a cyclohexane outlet and a methylcyclohexane outlet. The cyclohexane produced by the rectification unit can be collected or transported through the cyclohexane outlet, and the methylcyclohexane produced by the rectification unit can be collected or transported through the methylcyclohexane outlet. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the drawings needed in the specific embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0017] Figure 1 The flowchart of the embodiments of the present application is shown.

[0018] Explanation of reference signs:

[0019] 1, delayed coking unit; 2, first fractionating unit; 3, hydrofining unit; 4, second fractionating unit; 5, hydrocracking unit; 6, hydrodearomatization unit; 7, extractive rectification unit; 8, rectification unit; 101, coking oil gas; 102, pitch coke; 202a, phenol oil; 202b, mixed distillate oil; 202c, bottom cycle oil; 401, mixture of hydrofining oil and hydrocracking oil; 402a, naphtha fraction; 402b, diesel fraction; 402c, tail oil fraction; 701, dearomatized oil; 702a, paraffin component; 702b, naphthene component; 802a, cyclohexane; 802b, methylcyclohexane; 802c, naphthene. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] The following is combined Figure 1 The following describes embodiments of the present invention.

[0022] According to an embodiment of the present invention, a product production system using medium-temperature coal tar as raw material is provided, including a delayed coking unit 1, a first fractionation unit 2, a hydrorefining unit 3, a second fractionation unit 4, a hydrodearomatization unit 6, an extractive distillation unit 7, and a distillation unit 8; the medium-temperature coal tar enters through the feed inlet of the delayed coking unit 1.

[0023] In this configuration, the oil and gas outlet of the delayed coking unit 1 is connected to the inlet of the first fractionation unit 2; the mixed distillate oil outlet of the first fractionation unit 2 is connected to the inlet of the hydrorefining unit 3; the outlet of the hydrorefining unit 3 is connected to the inlet of the second fractionation unit 4; the tail oil fraction outlet of the second fractionation unit 4 is connected to the inlet of the hydrocracking unit; the outlet of the hydrocracking unit is connected to the inlet of the second fractionation unit 4; the naphtha fraction outlet of the second fractionation unit 4 is connected to the inlet of the hydrodearomatization unit 6; the outlet of the hydrodearomatization unit 6 is connected to the inlet of the extractive distillation unit 7; the cycloalkane component outlet of the extractive distillation unit 7 is connected to the inlet of the distillation unit 8; and the distillation unit 8 has a cycloalkane outlet.

[0024] The delayed coking device 1 is used for lightening treatment of the medium temperature coal tar, removing heavy components such as colloid pitch and mechanical impurities, and improving the liquid product yield. The coking oil gas 101 output by the coking device is introduced into the feed inlet of the first fractionating device 2 through the oil gas outlet. The first fractionating device 2 is used for separating the oxygen-containing compounds (mainly phenolic compounds) in the coking oil gas 101, and the separated oxygen-containing compounds are used as raw materials for phenol extraction and provide suitable raw materials for hydrogenation. The mixed distillate oil 202b output by the first fractionating device 2 is introduced into the feed inlet of the hydrogenation device 3 through the mixed distillate oil outlet. The hydrogenation device 3 is used for removing O, S, N heteroatoms and trace metal elements contained in the mixed distillate oil 202b. The hydrogenation product is mixed with the hydrogenation cracking oil mixture, and the mixture is introduced into the feed inlet of the second fractionating device 4 through the outlet of the hydrogenation device 3. The second fractionating device 4 is used for separating the hydrogenation product and the hydrogenation cracking oil mixture 401 into a naphtha fraction 402a, a diesel fraction 402b and a tail oil fraction 402c. The naphtha fraction 402a output by the second fractionating device 4 is introduced into the feed inlet of the hydrogenation de-aromatics device 6 through the naphtha fraction outlet. The hydrogenation de-aromatics device 6 is used for hydrogenation de-aromatics treatment of the naphtha fraction 402a. The de-aromatics oil 701 output by the hydrogenation de-aromatics device 6 is introduced into the feed inlet of the extractive distillation device 7 through the outlet of the hydrogenation de-aromatics device 6. The distillation device 8 is used for further separating the cycloalkane component 702b into cyclohexane 802a, methylcyclohexane 802b and other products.

[0025] In one embodiment, the first fractionating device 2 further comprises a phenol oil outlet and a bottom oil outlet. The phenol oil 202a output by the first fractionating device 2 is collected or transported through the phenol oil outlet, and the bottom oil 202c is collected or transported through the bottom oil outlet.

[0026] In one embodiment, the bottom oil outlet is connected to the feed inlet of the delayed coking device 1. The bottom oil 202c is mixed with the medium temperature coal tar and used as the feed of the delayed coking device 1.

[0027] In one embodiment, the delayed coking device 1 further comprises a coking outlet. The heavy components of the medium temperature coal tar are converted into pitch coke 102 after entering the delayed coking device 1, and the pitch coke 102 can be collected or transported through the coking outlet.

[0028] In one embodiment, the second fractionating device 4 further comprises a diesel fraction outlet and a tail oil fraction 402c outlet. The diesel fraction 402b output by the second fractionating device 4 is collected or transported through the diesel fraction outlet, and the tail oil fraction 402c output by the second fractionating device 4 is collected or transported through the tail oil fraction 402c outlet. The naphtha fraction 402a and the tail oil fraction 402c output by the second fractionating device 4 can be used as raw materials of the naphtha hydrogenation de-aromatics device 6 and the hydrogenation cracking device 5, respectively.

[0029] In one embodiment, further comprising:

[0030] A hydrocracking device 5, the feed inlet of the hydrocracking device 5 is connected with the outlet of the tail oil fraction 402c, and the outlet of the hydrocracking device 5 is connected with the feed inlet of the second fractionating device 4. The hydrocracking device 5 can be used to treat the tail oil fraction 402c of the second fractionating device 4 to be lightened, that is, to be treated by hydrocracking, and then mixed with the hydrorefined oil and hydrocracked oil mixture 401 to enter the second fractionating device 4 as feed.

[0031] In one embodiment, the extractive rectification device 7 further comprises a paraffin component outlet. The paraffin component 702a produced by the extractive rectification device 7 can be collected or transported through the paraffin component outlet.

[0032] In one embodiment, the rectification device 8 further comprises a cyclohexane outlet and a methylcyclohexane outlet. The cyclohexane 802a produced by the rectification device 8 can be collected or transported through the cyclohexane outlet, and the methylcyclohexane 802b produced by the rectification device 8 can be collected or transported through the methylcyclohexane outlet.

[0033] Compared with the existing patent 1 "CN 219689638 U" and the existing patent 2 "CN 106433777 A", the present application is to use the mixed fraction of the medium temperature coal tar after delayed coking treatment as the hydrogenation feed, to obtain naphtha fraction 402a and diesel fraction 402b through hydrofining and hydrocracking. The difference is that the present application aims to obtain as much naphthene 802c product as possible, and adjusts the process conditions of delayed coking, hydrofining and hydrocracking to produce more naphtha fraction 402a. At the same time, the present application does not use naphtha reforming, but directly uses the naphtha fraction 402a as the raw material of the hydrodearomatization device 6, and finally obtains the naphthene 802c product after hydrodearomatization, paraffin separation and rectification separation. The diesel fraction 402b is used as the feed of the diesel adsorption separation device outside the system, and the paraffin is used as the raw material for producing solvent oil products. Compared with the existing patent 2, the present application combines with the front-end hydrofining and hydrocracking process, and the naphtha does not need to be desulfurized, but is directly used as the raw material of the hydrodearomatization device 6 to obtain the dearomatized oil 701 after hydrodearomatization. The process is simple and the cost is low. At the same time, the paraffin / naphthene 802c separation process and the naphthene 802c rectification separation process of the present application are also different from the existing patent 2.

[0034] Although the embodiments of the present application are described in combination with the drawings, various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A product preparation system using medium-temperature coal tar as raw material, characterized in that, The device comprises a delayed coking device (1), a first fractionating device (2), a hydrofining device (3), a second fractionating device (4), a hydrodearomatization device (6), an extractive rectification device (7), and a rectification device (8). The oil gas outlet of the delayed coking device (1) is connected with the feed inlet of the first fractionating device (2), the mixed distillate oil outlet of the first fractionating device (2) is connected with the feed inlet of the hydrofining device (3), the outlet of the hydrofining device (3) is connected with the feed inlet of the second fractionating device (4), the naphtha fraction outlet of the second fractionating device (4) is connected with the feed inlet of the hydrodearomatization device (6), the outlet of the hydrodearomatization device (6) is connected with the feed inlet of the extractive rectification device (7), the naphthene component outlet of the extractive rectification device (7) is connected with the feed inlet of the rectification device (8), and the rectification device (8) has a naphthene outlet.

2. The system for producing products from medium temperature coal tar according to claim 1, wherein The first fractionating device (2) further comprises a phenol oil outlet and a bottom oil outlet.

3. The system for producing products from medium temperature coal tar according to claim 2, wherein The bottom oil outlet is connected with the feed inlet of the delayed coking device (1).

4. The system for producing products from medium temperature coal tar according to claim 1, wherein The delayed coking device (1) further comprises a coke outlet.

5. The system for producing products from medium temperature coal tar according to claim 1, wherein The second fractionating device (4) further comprises a diesel fraction outlet and a tail oil fraction outlet.

6. The system for producing products from medium temperature coal tar according to claim 5, wherein Further comprising: A hydrocracking device (5), the feed inlet of the hydrocracking device (5) is connected with the tail oil outlet, and the outlet of the hydrocracking device (5) is connected with the feed inlet of the second fractionating device (4).

7. The system for producing products from medium temperature coal tar according to claim 1, wherein The extractive rectification device (7) further comprises a paraffin component outlet.

8. The system for producing products from medium temperature coal tar according to claim 1, wherein The rectification device (8) further comprises a cyclohexane outlet and a methylcyclohexane outlet.

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