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

Method of preparing butadiene from normal alkane

A technology for n-alkane and butadiene is applied in the field of preparing butadiene to achieve the effects of reduced energy consumption and low energy consumption

Active Publication Date: 2014-01-01
CHINA PETROLEUM & CHEM CORP +1
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the processes according to these patent applications still only achieve yields of 5-7% by weight of butadiene

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
  • Method of preparing butadiene from normal alkane
  • Method of preparing butadiene from normal alkane

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] The preparation method of the catalyst shown in above-mentioned formula (1) can comprise:

[0036] (a) preparing the urethane-modified silica gel shown in formula (3),

[0037] Formula (3)

[0038] The specific process may be as follows: the silica gel is first washed with distilled water, then washed with acetic acid, and then vacuum-dried. Then reflux with hydrochloric acid to obtain hydroxylated silica gel. The hydroxylated silica gel is contacted with phenylisocyanate. The temperature of the vacuum drying may be 50-70°C. The concentration of the hydrochloric acid may be 25-50% by weight. The time for the reflux can be 3-5 hours. The conditions for the contact reaction between the hydroxylated silica gel and phenyl isocyanate may include: a reaction temperature of 35-45° C., and a reaction time of 4-10 hours. This procedure can be referred to S. Siggia, Quantitative Organic Analysis, third ed., Wiley, New York, 1963, p.558.

[0039] (b) preparing the zirconi...

Embodiment 1

[0062] This example is used to illustrate the method for preparing butadiene from normal alkanes of the present invention.

[0063] (1) Cyclization

[0064] A catalyst with a structural formula as shown in formula (1) is used (wherein, R 2 is hydrogen, n is 2) as a cyclization catalyst to carry out cyclization reaction on n-hexane. The preparation method of the cyclization catalyst can refer to Reforming of n-hexane in presence of[1,2-bis(salicylidene amino)-phenylene]-zirconium complex chemically bound on modified silica gel support (K.S.Anisia, G.S.Mishra, A. Kumar, Journal of Molecular Catalysis A: Chemical 215 (2004) 121-128).

[0065] The conditions of the cyclization reaction include: the reaction temperature is 190° C., the reaction pressure is 1 MPa, and the reaction time is 3 hours. The amount of cyclization catalyst used was 0.759 parts by weight relative to 100 parts by weight of n-hexane, and the cyclization product whose composition was shown in Table 2 was obt...

Embodiment 2

[0080] This example is used to illustrate the method for preparing butadiene from normal alkanes of the present invention.

[0081] Carry out cyclization, isomerization and steam cracking according to the method of Example 1, the difference is that in the steam cracking process, the mixture of isomerization product and naphtha in a weight ratio of 1:1 is injected into CBL- The steam cracking reaction is carried out in the type III cracking furnace.

[0082] The cracked gas was analyzed according to the method of Example 1, and the yield of butadiene and the yield of methane were calculated, and the results are shown in Table 5 below. Then, the cracked gas was separated according to the method of Example 1, and the energy consumption of the cold box was recorded. The results are shown in Table 5 below.

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

No PUM Login to View More

Abstract

The invention provides a method of preparing butadiene from normal alkane. The method comprises following steps: (1) in the presence of a cyclization catalyst, subjecting normal alkane to carry out cyclization reactions so as to obtain a hydrocarbon mixture containing alkyl cyclopentane; (2) in the presence of an isomerization catalyst and an initiator, subjecting the hydrocarbon mixture containing alkyl cyclopentane to carry out isomerization reactions so as to obtain a hydrocarbon mixture containing cyclohexane or alkyl cyclohexane; (3) taking the hydrocarbon mixture containing cyclohexane or alkyl cyclohexane as at least part of cracking raw materials to carry out cracking reactions. The method of preparing butadiene from normal alkane has a high yield of butadiene and a low yield of methane, and thus reduces the energy consumption of the cooling box during the separation process of cracking gas.

Description

technical field [0001] The invention relates to a method for preparing butadiene from normal alkanes. Background technique [0002] Butadiene usually refers to 1,3-butadiene, also known as vinyl ethylene, which is an important petrochemical basic raw material next to ethylene and propylene. Butadiene is mainly used in synthetic rubber and resins, such as polybutadiene rubber (BR), styrene-butadiene rubber (SBR), nitrile rubber (NBR), styrene-butadiene polymer latex, styrene thermoplastic elastomer (SBC) and Acrylonitrile-butadiene-styrene (ABS) resin. In addition, butadiene can also be used to produce organic chemical products such as adiponitrile, hexamethylenediamine, nylon-66, and 1,4-butanediol, which are widely used in many fields. [0003] For the preparation of butadiene, the traditional method is to steam crack raw materials such as light hydrocarbons, naphtha, and hydrogenated tail oil. However, the main products in the steam cracking process are ethylene, propyl...

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): C07C11/167C07C2/76C07C4/06C07C5/333
Inventor 石莹杜志国王国清郭莹郏景省李蔚
Owner CHINA PETROLEUM & CHEM CORP