公开(公告)号：WO1993001132A1

公开(公告)日：1993-01-21

申请号：PCT/US1992004660

申请日：1992-06-05

Applicant: THE DOW CHEMICAL COMPANY

Inventor： THE DOW CHEMICAL COMPANY ,  KHAZAI, Bijan ,  MOORE, William, G.

IPC: C01B35/04

CPC classification number: C01B35/04

Abstract: A reactant mixture containing a metal compound, a carbon source, and a boron source having an average agglomerate particle size of up to about 200 νm is heated to convert said mixture to the corresponding metal boride. The resultant metal boride has an average particle size of 0.05 to 0.5 micron.

公开(公告)号：WO1993011092A1

公开(公告)日：1993-06-10

申请号：PCT/US1992010080

申请日：1992-11-24

Applicant: THE DOW CHEMICAL COMPANY

Inventor： THE DOW CHEMICAL COMPANY ,  VRIELAND, G., Edwin ,  DOKTYCZ, Stephen, J. ,  KHAZAI, Bijan

IPC: C07C11/167

CPC classification number: C03C14/004 ,  B01J23/28 ,  B01J37/0018 ,  C03C2214/04 ,  C07C5/42 ,  C07C2521/04 ,  C07C2521/08 ,  C07C2521/10 ,  C07C2523/04 ,  C07C2523/28 ,  C07C11/167

Abstract: A process for preparing olefins and diolefins in high productivity which involves contacting an aliphatic hydrocarbon, such as butane, with a heterogeneous catalyst composition containing reactive oxygen under reaction conditions sufficient to produce a more highly unsaturated aliphatic hydrocarbon, such as 1,3-butadiene. The catalyst composition contains a glassy silica matrix of specified surface area and macroporosity into which are encapsulated domains of a catalyst component containing oxides of magnesium and molybdenum. The catalyst has high crush strength and is useful in transport reactors.

Abstract translation: 一种以高生产率制备烯烃和二烯烃的方法，其包括使脂族烃如丁烷与含有活性氧的非均相催化剂组合物在足以产生更高度不饱和的脂族烃如1,3-丁二烯的反应条件下接触。 催化剂组合物含有具有特定表面积和大孔性的玻璃状二氧化硅基质，其中含有含有镁和钼的氧化物的催化剂组分的包封区域。 该催化剂具有很高的压碎强度，并且可用于运输反应器。

公开(公告)号：WO1989011459A1

公开(公告)日：1989-11-30

申请号：PCT/US1989002064

申请日：1989-05-12

Applicant: THE DOW CHEMICAL COMPANY

Inventor： THE DOW CHEMICAL COMPANY ,  KHAZAI, Bijan ,  MOORE, William, G.

IPC: C04B35/52

CPC classification number: C04B35/58071 ,  C04B35/563 ,  C04B35/645 ,  C04B35/65

Abstract: A boron carbide/titanium diboride composite ceramic powder is disclosed produced by mixing boron carbide and a titanium source, such that the average reactant particle size is less than 20 micrometers and substantially all discrete reactant areas are less than 50 micrometers, followed by heating the mixture wherein the boron carbide particles form substrates to which the titanium diboride particles are attached. The resulting powder has boron carbide and titanium diboride particles less than 20 micrometers in diameter. This powder can then be densified to form a part wherein the titanium diboride grains have an average size of less than 20 micrometers and the boron carbide grains having an average size of less than 50 micrometers. Because of the uniformity of initial dispersion, the densified part shows a microstructure that is also very uniform in distribution of boron carbide and titanium diboride.