Unlock instant, AI-driven research and patent intelligence for your innovation.

Denitrification method for aromatics raffinate oil

A raffinate oil and denitrification technology, which is applied in the field of aromatic raffinate oil and aromatic raffinate oil denitrification, can solve the problems of increased cost of aromatic raffinate oil denitrification, loss of adsorption activity of activated clay, and environmental pollution.

Inactive Publication Date: 2016-03-02
CHINA PETROLEUM & CHEM CORP +1
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the above-mentioned technical scheme, when the total nitrogen adsorbed by the activated clay reaches saturation or the total nitrogen in the aromatic hydrocarbon raffinate product at the outlet of the adsorbent bed is ≥0.5mg / kg, the activated clay needs to be replaced again, and the discharged activated clay may be carried out Landfill or high-temperature incineration treatment, which increases the denitrification cost of aromatic raffinate oil and produces a large amount of solid waste, causing serious environmental pollution
Although the adsorbed saturated activated clay has the possibility of pyrolysis on the surface of the amine salt formed by the B acid and L acid center and the nitrogen atom of morpholine, but at a temperature of 220-260 ° C, only a part of the amine Salt decomposition, activated clay only restores part of its acidity, if the regeneration temperature continues to increase to 350 ° C, activated clay will lose its adsorption activity due to crystallization

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Denitrification method for aromatics raffinate oil
  • Denitrification method for aromatics raffinate oil
  • Denitrification method for aromatics raffinate oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment (1～10

[0015] Nitrogen removal of aromatic raffinate in a size of carried out in a stainless steel tubular fixed-bed reactor. 100 g of sulfonic acid-based cation exchange resin is filled in the reactor, and the particle size of the resin is 0.40-1.25 mm. The outside of the reactor is equipped with an electric heating temperature control system, and temperature measuring platinum resistors are respectively installed on the upper, middle and lower parts of the resin bed. The amount of reaction feed is controlled by a feed pump, and the system pressure is regulated by a back pressure valve. The total nitrogen content in the aromatic raffinate oil used as the raw material is 10 mg / kg, and the neutral test is alkaline; the total nitrogen content in the aromatic raffinate oil after denitrification is ≤0.5 mg / kg, and the neutral test is qualified. The indicators of the catalyst are shown in Table 1, and the conditions and results of each embodiment are shown in Table 2.

Embodiment 11

[0023] The resin saturated with adsorbed morpholine is soaked in sulfuric acid solution with 3 times the volume concentration of 4-5 wt% for 2 hours, then washed with deionized water until pH = 7, and then dried. The regenerated strongly acidic cation exchange resin is then subjected to denitrification reaction. The conditions and results are shown in Table 3. The regenerated mass exchange capacity is the same as that of the fresh one.

[0024] table 3

[0025]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
specific surface areaaaaaaaaaaa
pore sizeaaaaaaaaaa
specific surface areaaaaaaaaaaa
Login to View More

Abstract

The invention discloses a denitrification method for aromatics raffinate oil. The method comprises the steps that the aromatics raffinate oil containing morpholine is denitrified through a fixed bed adsorbent bed layer formed by strong-acid cation exchange resin, so that the morpholine in the aromatics raffinate oil is chemically adsorbed on the resin surface to be removed. During denitrification, the mass airspeed is 1-3 hr<-1>, the temperature is 20 DEG C-50 DEG C, and the pressure is 0.3-1.0 MPa. Macroporous sulfonyl cation exchange resin is adopted as the strong-acid cation exchange resin, the mass exchange capacity of the macroporous sulfonyl cation exchange resin is 3-5.5 mmol / g, the specific surface area is 40-70 m<2> / g, the pore capacity is 0.25-0.50 ml / g, and the average pore size is 20-60 nm. According to the method, the denitrification precision and the saturated adsorption capacity are high, and the consumption is significantly reduced; regeneration can be performed through a simple acid pickling mode at normal temperature, and therefore the discharge amount of solid waste capable of causing environmental pollution can be significantly decreased.

Description

technical field [0001] The invention belongs to the technical field of petroleum processing, and in particular relates to a method for denitrifying aromatic hydrocarbon raffinate oil, in particular to a method for passing aromatic hydrocarbon raffinate oil containing basic substance morpholine through a fixed-bed adsorbent composed of strongly acidic cation exchange resin A method for denitrifying the bed to obtain aromatic raffinate oil with a total nitrogen content of ≤0.5mg / kg. Background technique [0002] When high-purity benzene and toluene products are produced by morphofurine extraction and distillation technology using pyrolysis hydrogenated gasoline as raw material, raffinate oil is produced by-product at the same time. When aromatics are raffinated, the solvent morphfurin used will undergo a hydrolysis reaction to generate basic morpholine (chemically named 1,4-oxazepine), resulting in the nitrogen content in the aromatics raffinated oil product. If it is directl...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C10G25/02
Inventor 徐泽辉张彩娟常慧夏荣辉曹强叶军明赵剑萍
Owner CHINA PETROLEUM & CHEM CORP