A kind of preparation method who is used to produce the raw material of dicumyl peroxide
Technical field
The present invention relates to a kind of preparation method who is used to produce the raw material of dicumyl peroxide, belong to isopropyl benzene catalyzed oxidation technical field.
Background technology
Dicumyl peroxide (DCP) is important novel organo-peroxide auxiliary agent, is optimum good initiator, vulcanizing agent, linking agents of macromolecular materials such as natural gum, synthetical glue, polyvinyl resin, and purposes is widely arranged.
The production process of DCP, it generally is raw material with the isopropyl benzene, yellow soda ash or sodium hydroxide are catalyzer, under the oxidation of air or oxygen, cumene oxidation is become hydrogen phosphide cumene, again hydrogen phosphide cumene is reduced into dimethyl benzyl alcohol with S-WAT, dimethyl benzyl alcohol and hydrogen phosphide cumene are condensed into DCP in 1: 1 ratio under the catalysis of acid.Reaction process is as shown in Figure 1:
At present, about patent and the bibliographical information of DCP fewer, relevant patent also majority concentrates on cumene oxidation decomposition production phenol field, main purpose all is on the selectivity for transformation efficiency that improves isopropyl benzene and hydrogen phosphide cumene, as U.S. Pat 6291718, all mentioned among the US6476276 in the oxidation of alkylbenzene and to have added a kind of special compound that can Mulberry Extract.In the mixture of 144g isopropyl benzene and 36g isopropyl benzene hydroperoxide, add 2,2,6 of 18mg, 6-tetramethyl piperidine oxide compound, all these joins 0.05% the Na of 90g
2CO
3In the aqueous solution, react after 3 hours, the selectivity of isopropyl benzene hydroperoxide is 91mol%.As mentioning with alkali ionic liquid in Chinese patent 200810102379.1 is catalyst oxidation isopropyl benzene and diisopropylbenzene(DIPB), can improve the transformation efficiency of diisopropylbenzene(DIPB) significantly and to the selectivity of hydrogen peroxide product.
Summary of the invention
Purpose of the present invention is reduced into the link of benzylalcohol with hydrogen phosphide cumene in the DCP production process, and a kind of preparation method who is used to produce the raw material of DCP is provided, and the direct condensation of gained mixture of the present invention can be generated DCP.
For achieving the above object, technical scheme of the present invention: the mixture that adopts alkali ionic liquid and yellow soda ash as oxygen source, is made isopropyl benzene the mixture of hydrogen phosphide cumene and dimethyl benzyl alcohol with air as catalyzer through catalyzed oxidation.
Alkali ionic liquid of the present invention is imidazole type, pyridine type, quaternary ammonium or quaternary alkylphosphonium salt type alkali ionic liquid, and concrete structure is as follows:
X-=OH in the following formula
-, R, R
1, R
2, R
3, R
4, R ' is C
1-C
18Alkyl, be preferably C
1-C
16Alkyl, R, R
1, R
2, R
3, R
4, R ' can be identical, also can be inequality.
The known art methods preparation that the used alkali ionic liquid of the present invention adopts those skilled in the art to know.
The mass ratio of described alkali ionic liquid and yellow soda ash is 1-100: 1.
Add ion liquid quality in the catalytic oxidation process and be 0.001~1 times of isopropyl benzene, be preferably: 0.002~0.5 times.
The temperature of reaction of catalyzed oxidation is 60~150 ℃, and air flow quantity is 25~120L/ (a hmol isopropyl benzene), and the reaction times is 2~72 hours, is preferably 15~36 hours.
The invention effect: method of the present invention adopts alkali ionic liquid and sodium carbonate mixture as catalyzer, when having improved THE AUTOXIDATION OF CUMENE speed, produce a considerable amount of hydrogen phosphide cumenes and dimethyl benzyl alcohol, being about to cumene oxidation becomes hydrogen phosphide cumene and dimethyl benzyl alcohol ratio near 1: 1 mixture, avoided in the DCP production process hydrogen phosphide cumene being reduced into the link of benzylalcohol, the direct condensation of this mixture can generate DCP.Can directly carry out condensation and obtain DCP, save the reduction step in the DCP raw material production process, reduce the DCP production cost.And adopt the alkali ionic liquid polymkeric substance as catalyzer, not only improve the rate of oxidation of alkylbenzene and the selectivity of raising hydroperoxide, catalyzer separates with reactant flow easily simultaneously, has reduced the shadow to subsequent technique.
Description of drawings
Fig. 1 isopropyl benzene prepares the reaction process of DCP.
Embodiment
Comparative Examples 1
Comparative Examples 1 is the base catalysis method for oxidation that adopts usually.
Getting the 15g isopropyl benzene is put in the there-necked flask of taking back stream device, stirring, add the mass percentage concentration 1.5gNaOH aqueous solution (mass concentration 2%), 90 ℃ of temperature of reaction, bubbling air 200ml/min, react after 24 hours, the transformation efficiency of isopropyl benzene is 30%, and the selectivity of hydrogen phosphide cumene is 90%.
Embodiment 1
Getting the 15g isopropyl benzene is put in the there-necked flask of taking back stream device, stirring, add 0.08g hydroxide 1-methyl, the 3-butyl imidazole, 0.02g yellow soda ash, 60 ℃ of temperature of reaction, bubbling air 200ml/min, react after 24 hours, the transformation efficiency of isopropyl benzene is 80%, and the selectivity of hydrogen phosphide cumene is 45%, the selectivity 40% of dimethyl benzyl alcohol.
Embodiment 2
Getting the 15g isopropyl benzene is put in the there-necked flask of taking back stream device, stirring, add 0.1g hydroxide 1-methyl, 3-hexyl imidazoles, 0.1g yellow soda ash, 90 ℃ of temperature of reaction, bubbling air 150ml/min reacts after 36 hours, the transformation efficiency of isopropyl benzene is 94%, and the selectivity of hydrogen phosphide cumene is 37%.The selectivity 40% of dimethyl benzyl alcohol.
Embodiment 3
Get the 15g isopropyl benzene and be put in the there-necked flask of taking back stream device, stirring, add 6.69g hydroxide butyl-pyridinium, 1.02g yellow soda ash, 90 ℃ of temperature of reaction, bubbling air 150ml/min reacts after 36 hours, the transformation efficiency of isopropyl benzene is 94%, and the selectivity of hydrogen phosphide cumene is 42%.The selectivity 40% of dimethyl benzyl alcohol.
Embodiment 4
Getting the 20g isopropyl benzene is put in the there-necked flask of taking back stream device, stirring, add the 1.54g tetraethyl ammonium hydroxide, 0.62g 100 ℃ of yellow soda ash temperature of reaction, bubbling air 160ml/min, react after 33 hours, the transformation efficiency of isopropyl benzene is 99%, and the selectivity of hydrogen phosphide cumene is 35%, the selectivity 30% of dimethyl benzyl alcohol
Embodiment 5
Getting the 15g isopropyl benzene is put in the there-necked flask of taking back stream device, stirring, add 0.07g hydroxide 1-methyl 3-ethyl imidazol(e), 0.02g yellow soda ash, 105 ℃ of temperature of reaction, bubbling air 100ml/min reacted after 20 hours, and the transformation efficiency of isopropyl benzene is 75%, the selectivity of hydrogen peroxide isopropyl benzene is 46%, the selectivity 42% of dimethyl benzyl alcohol
Embodiment 6
Getting the 15g isopropyl benzene is put in the there-necked flask of taking back stream device, stirring, add 2.00g hydroxide 1-methyl 3-octadecyl imidazoles, 0.02g yellow soda ash, 100 ℃ of temperature of reaction, bubbling air 100ml/min reacted after 16 hours, and the transformation efficiency of isopropyl benzene is 85%, the selectivity of hydrogen peroxide isopropyl benzene is 49%, the selectivity 44% of dimethyl benzyl alcohol.