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cleavage c 9+ Method for removing naphthalene from hydrogenated solvent oil and low-naphthalene aromatic hydrocarbon solvent oil

A solvent oil and denaphthalene removal agent technology, which is used in the refining of hydrocarbon oil, petroleum industry, adsorption purification/separation, etc., can solve the problems of lower solubility of decalin than aromatic hydrocarbons, high cost, energy consumption, and difficulty in separation, etc. Significant social and economic benefits, less equipment corrosion and environmental pollution, and high naphthalene removal efficiency

Active Publication Date: 2019-08-23
NINGBO CESTOIL ADVANCED MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are usually two methods for removing naphthalene in industry: one is rectification, but due to the cracking of C 9+ The components of hydrogenated solvent oil have similar boiling points, so it is more difficult to separate by rectification; to improve the separation efficiency, it is necessary to increase the number of trays, and the cost and energy consumption are high
The second is to crack C 9+ Hydrogenated solvent oil is deeply hydrogenated to tetrahydronaphthalene, but this method has high cost and poor selectivity, because this method requires the use of noble metal catalysts, and noble metal catalysis can easily lead to excessive hydrogenation of naphthalene into saturated decahydronaphthalene , the solubility of decahydronaphthalene is not as good as that of aromatic hydrocarbons, and it is easy to separate out from solvent oil, which greatly limits its application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Add 900 kilograms of water into the enamel kettle, then add 100 kilograms of 98wt% concentrated sulfuric acid in batches, and then add 200 kilograms with a specific surface area of ​​800m 2 / g, the surface hydroxyl density is 6.1 / nm 2 The modified molecular sieve (measured by infrared spectroscopy, the same below) was stirred at room temperature for 2 hours, filtered, and the filter cake was purged with dry hot nitrogen at 120°C for 8 hours to obtain the supported naphthalene removal agent.

[0041] Then fill the supported naphthalene-removing agent into the fixed bed, set the fixed bed temperature to 100℃, and crack the C with 130ppm naphthalene. 9+ Hydrogenated solvent oil for 2h -1 Flow through the fixed bed for denaphthalene removal treatment, and obtain a low naphthalene aromatic hydrocarbon with a naphthalene content of 5 ppm (measured by gas chromatography, the same below) and a color of 28 (measured by the Saybolt colorimeter, the same below) Solvent oil. The conten...

Embodiment 2

[0044] Add 950 kilograms of water into the enamel kettle, then add 50 kilograms of 98% concentrated sulfuric acid in batches, and then add 200 kilograms with a specific surface area of ​​500m 2 / g, surface hydroxyl density is 5.0 / nm 2 The modified silica gel is stirred at 50°C for 8 hours, filtered, and the filter cake is purged with dry hot nitrogen at 150°C for 2 hours to obtain the supported naphthalene release agent.

[0045] Then fill the supported naphthalene-removing agent into the fixed bed, set the fixed bed temperature to 70℃, and crack the C with 160ppm naphthalene. 9+ Hydrogenated solvent oil for 10h -1 The naphthalene removal treatment is carried out by the space velocity flow through the fixed bed to obtain a low naphthalene aromatic solvent oil with a naphthalene content of 8 ppm and a chromaticity of 28.

[0046] After running for one week, take out the loaded naphthalene removal agent, soak in water, filter, and cook the filtrate at 170°C for 1 hour, and then extract...

Embodiment 3

[0048] The specific surface area of ​​200 kg is 700m 2 / g, the surface hydroxyl density is 4.5 / nm 2 The modified activated carbon is added to 1000 kg of 8wt% dilute sulfuric acid, stirred at room temperature for 6 hours, filtered, and the filter cake is purged with dry hot nitrogen at 140°C for 6 hours to obtain a supported naphthalene removal agent.

[0049] Then fill the supported naphthalene-removing agent into the fixed bed, set the fixed bed temperature to 85℃, and crack the C with 150ppm naphthalene. 9+ Hydrogenated solvent oil for 5h -1 The naphthalene removal treatment is carried out by the space velocity flow through the fixed bed to obtain a low naphthalene aromatic solvent oil with a naphthalene content of 5.5 ppm and a chromaticity of 29.

[0050] After one week of operation, take out the loaded naphthalene removal agent, soak in water, filter, and cook the filtrate at 180°C for 1 hour, and then extract with toluene. The extract is dried and dissolved to obtain light yell...

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Abstract

The preparation method comprises a naphthalene removal method for cracking C9+ hydrogenation solvent oil and low-naphthalene aromatic solvent oil. The naphthalene removal method comprises the following steps: soaking a carrier with hydroxyl groups on the surface in a dilute sulfuric acid solution, performing filtration to obtain a solid, and performing drying to obtain a supported naphthalene removal agent, wherein the carrier with the hydroxyl groups on the surface has the specific surface area of 500-800 m<2> / g and the surface hydroxyl density of 4.5-6.1 / nm<2>; filling a fixed bed with the supported naphthalene removal agent; and performing naphthalene removal treatment on the cracking C9+ hydrogenation solvent oil via the fixed bed filled with the supported naphthalene removal agent atthe air speed of not higher than 20 h<-1> to obtain the low-naphthalene aromatic solvent oil. The naphthalene removal method for cracking C9+ hydrogenation solvent oil is simple in process and high innaphthalene removal efficiency, can be continually operated, causes little corrosion to equipment and little pollution to the environment, and avoids the problems of poor rectification and deep hydrogenation separation effect and high cost. The low-naphthalene aromatic solvent oil subjected to naphthalene removal by the naphthalene removal method is light in color, strong in dissolving capacity,contains extremely low naphthalene (10 ppm or below), conforms to the European and American standards and can bring about remarkable social and economical benefits through large-scale production and application.

Description

Technical field [0001] The invention relates to the technical field of industrial naphthalene removal, in particular to a cracking C 9+ Method for removing naphthalene from hydrogenated solvent oil and low-naphthalene aromatic solvent oil. Background technique [0002] In recent years, with the rapid development of my country's petroleum and chemical industries, the demand for solvent oil has continued to increase. Crack C 9+ Distillate is a by-product of petroleum cracking to produce ethylene to crack C 9+ Hydrogenation of raw materials to produce aromatic solvent oil is an optimized utilization of the by-products of ethylene cracking. It can also greatly reduce the production cost of aromatic solvent oil, which can produce huge social and good economic benefits. [0003] Crack C 9+ The fraction is rich in alkylbenzene, aromatic hydrocarbons, diolefins, naphthalene and its homologues (hereinafter collectively referred to as naphthalene), sulfur-containing compounds and other compo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G25/00C10G25/03C10L1/04C07C7/12C07C15/24
Inventor 严斌熊靓
Owner NINGBO CESTOIL ADVANCED MATERIAL CO LTD
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