Shanghai Huayi Acrylic Acid Co., Ltd.

Other

Jingming Shao

Yan Zhuang

Xin Wen

Xiaodong Chu

Jianxue Ma

Xuemei Li

Ge Luo

Xiaoqi Zhao

Kun Jiao

Jian Wang

Jun Li

Jun Yin

Xiaodong Zhu

Chunlei Zhang

Chunhua Qin

Shuju Liu

Shengxian Xu

Peizhang Zhang

Linghua Zuo

Shiqiang Feng

Kaimin Shi

The present invention provides a process for regenerating a deactivated heteropolymolybdophosphoric acid catalyst, comprising the steps of grinding the deactivated catalyst into particles having a particle size of 40 mesh or less, mixing the particles with a mixture comprising aqua ammonia, an aqueous solution containing ammonium ions and organic auxiliaries, kneading the same in a kneader to obtain a paste, drying the paste, molding the paste into cylindrical particles with a through hole in its longitudinal axis, and heating the paste in atmosphere at 350&#x2dc;450&#xb0; C. for 1&#x2dc;10 hours to produce the generated catalyst.

Process for regenerating a deactivated heteropolymolybdophosphoric acid catalyst

The present invention provides a complex oxide catalyst whose general formula is MoVCuWXYO/Z. reducing agent needs to be added into the catalyst during the preparation process of the active component of the catalyst and (or) molding process of the catalyst. Specifically, X is at least one selected from a group consisting of Nb, Sb, Sr, Ba and Te; Y is at least one selected from a group consisting of La, Ce, Nd, Sm and Cs; 'a' is ranging from 2 to 8; 'b' is ranging from 1 to 6; &#x201c;c&#x201d; is ranging from 0.5 to 5; &#x201c;d&#x201d; is ranging from 0.01 to 4; &#x201c;e&#x201d; is ranging from 0.01 to 4; f is determined by the oxidation state of the component element; Z is silicon powder; the reducing agent is C2&#x2dc;C6 diol or polyol.

Preparation process of a complex oxide catalyst and application thereof to the synthesis of the acrylic acid

A method of preparing a catalyst for producing acrolein by oxidation of propylene at high space velocity, said catalyst is a Mo&#x2014;Bi&#x2014;Fe&#x2014;Co based composite metal oxide. Producing unsaturated aldehyde via partial oxidation of lower unsaturated olefin at high space velocity using said catalyst is suitable for process with or without off-gas recirculating. Said catalyst is prepared by co-precipitation, the reaction conditions for using said catalyst to produce unsaturated aldehyde are, the space velocity of unsaturated lower olefin relative to catalyst being 120&#x2dc;200 h-1(STP), reaction temperature being 300&#x2dc;420&#xb0; C. and absolute pressure being 0.1&#x2dc;0.5 MPa; a single-stage unsaturated lower olefin conversion ratio of greater than 98.0% and carbon oxide yield of less than 3.3% with an overall yield of unsaturated lower aldehyde and acid of greater than 94.0% are obtained. The process to prepare the said catalyst is simple, easy to be repeated, and capable of industrial scale-up.

Catalyst for producing unsaturated aldehyde by oxidation of lower olefin at high space velocity

The present invention provides a preparation process of complex oxides catalyst containing Mo, Bi, Fe and Co, which comprising steps as following: dissolving precursor compounds of the components for catalyst and complexing agent in water to obtain a solution, and then drying, molding and calcining the solution to obtain catalyst. The catalyst is used for gas phase oxidation of light alkenes to unsaturated aldehydes. The catalyst has high activity, selectivity and stability. The reaction condition is mild. The preparation process of the catalyst is easy to operate and can be used for mass production.

Preparation process of a catalyst used for gas phase oxidation of light alkenes to unsaturated aldehydes

There is provided a method for rectifying a vinyl compound liquor. The method includes the steps of a) providing a rectification column operated at a temperature and pressure and b) feeding the vinyl compound liquor to be rectified into the rectification column, wherein the pressure of the rectification column and the temperature of the fed vinyl compound liquor are controlled, such that the temperature of the fed vinyl compound liquor ranges from its bubble point at the pressure of the rectification column to 10&#xb0; C. lower than the bubble point.

Method for producing (meth)acrylic acid and (meth)acrylic esters

A catalyst composition for use in manufacturing methacrolein by reacting with one of isobutene and t-butanol, the catalyst composition being represented by the formula of: x (MoBiFeCoABO)/y Z. MoBiFeCoABOis an oxide compound. Z is a catalyst carrier is one of graphite, boron, silicon, germanium powder, and a mixture thereof. Mo, Bi, Fe, Co, and O are chemical symbols of molybdenum, bismuth, iron, cobalt, and oxygen respectively. A is one of W, V, Ti, Zr, Nb, Ni, and Re. B is one of K, Rb, Cs, Sr, and Ba. The catalyst is adapted to not only enhance the production of methacrolein with high activeness and high selectivity but also effectively control the heat point of the catalyst during the methacrolein manufacturing process to prolong the catalyst life.

Catalyst composition and producing process thereof for use in manufacturing methacrolein

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Shanghai, China

Jingming Shao