阅读说明：本技术 用于乙烯聚合的氧化铬催化剂 (Chromium oxide catalyst for ethylene polymerization ) 是由 V·阿利耶夫 X·谭 于 2020-03-09 设计创作，主要内容包括：本发明涉及一种固体催化剂体系,其包含第一铬化合物、第二铬化合物、烷基铝化合物与含氮化合物的反应产物,以及氧化硅载体,其中第一铬化合物为三氧化铬或可转化为三氧化铬的化合物,第二铬化合物为甲硅烷基铬酸酯化合物,并且含氮化合物为环烷基胺化合物,其通式为R～(3)-NH-(2),其中R～(3)选自C3-C8环烷基。(The present invention relates to a solid catalyst system comprising a first chromium compound, a second chromium compound, a reaction product of an alkyl aluminum compound and a nitrogen-containing compound, and a silica support, wherein the first chromium compound is chromium trioxide or a compound convertible thereto, the second chromium compound is a silyl chromate compound, and the nitrogen-containing compound is a cycloalkylamine compound having the general formula R 3 ‑NH 2 Wherein R is 3 Is selected from C3-C8 cycloalkyl.)

1. A solid catalyst system comprising the reaction product of a first chromium compound, a second chromium compound, an aluminum alkyl compound, and a nitrogen containing compound, and a silica support, wherein

The first chromium compound is chromium trioxide or a compound convertible to chromium trioxide,

the second chromium compound is a silyl chromate compound, and

the nitrogen-containing compound is a cycloalkylamine compound with the general formula R³-NH₂Wherein R is³Is selected from C3-C8 cycloalkyl.

2. The solid catalyst system according to claim 1, wherein the first chromium compound is selected from the group consisting of chromium trioxide, chromium acetylacetonate, chromium chloride, chromium nitrate, chromium acetate hydroxide, chromium sulfate, ammonium chromate, and ammonium dichromate.

3. The solid catalyst system according to any of the preceding claims, wherein the amount of Cr in the catalyst system is 0.10-2.0 wt%, such as 0.20-1.0 wt% or 0.50-0.90 wt%.

4. The solid catalyst system of any one of claims 1-3, wherein the amount of the first chromium compound is greater than 35 wt% and up to 90 wt% relative to the total amount of the first chromium compound and the second chromium compound.

5. The solid catalyst system of any one of claims 1-3, wherein the amount of the first chromium compound is at least 10 wt% and at most 35 wt% relative to the total amount of the first chromium compound and the second chromium compound.

6. The solid catalyst system according to any one of the preceding claims, wherein the alkyl aluminum compound is selected from trimethyl aluminum, triethyl aluminum, triisobutyl aluminum, tri-n-hexyl aluminum, and trioctyl aluminum.

7. The solid catalyst system according to any one of the preceding claims, wherein the nitrogen-containing compound is selected from cyclopropylamine, cyclobutylamine, cyclopentylamine, cyclohexylamine, cycloheptylamine and cyclooctylamine, more preferably from cyclohexylamine and cyclooctylamine, most preferably cyclohexylamine.

8. The solid catalyst system according to any of the preceding claims, wherein the molar ratio of the amount of Al in the solid catalyst system relative to the amount of Cr in the solid catalyst system is 0.1-25, preferably 0.5-10, 1.0-5.0, 1.1-3.0, 1.3-1.9 or 1.4-1.7.

9. The solid catalyst system according to any one of the preceding claims, wherein the silica support has an average particle size of 20-50 μm, and/or at least 0.8cm³And/or a pore volume of 150-²Surface area in g.

10. The solid catalyst system according to any one of the preceding claims, further comprising a non-chromium metal compound, preferably consisting of Tm (OR)⁵)_nX_4-nAnd Tm (R)⁶)_nX_4-nIs shown in which

Tm represents a transition metal of group IVB, VB or VIB,

R⁵and R⁶Independently selected from C1-C20 alkyl, C1-C20 aryl and C1-C20 cycloalkyl,

x represents a halogen atom, preferably chlorine, and

n represents a value satisfying 0. ltoreq. n.ltoreq.4, preferably 1. ltoreq. n.ltoreq.4.

11. The solid catalyst system according to claim 10, wherein the non-chromium metal compound is a titanium alkoxide selected from the group consisting of tetraethoxytitanium, tetramethoxytitanium, tetrabutoxytitanium, tetrapropoxytitanium (particularly, tetraisopropoxytitanium), tetraisobutoxytitanium, tetrapentoxytitanium, triethoxycetanium dichloride, diethoxytitanium dichloride, trichloroethoxytitanium, methoxytitanium trichloride, dimethoxytitanium dichloride, ethoxytitanium trichloride, diethoxytitanium dichloride, propoxytitanium trichloride, dipropoxytitanium dichloride, butoxytitanium trichloride, butoxytitanium dichloride and titanium tetrachloride.

12. Process for the preparation of the solid catalyst system according to any one of the preceding claims, comprising i) mixing a silica support provided with the first chromium compound and optionally a non-chromium compound with the second chromium compound, and ii) treating the product resulting from step i) with the reaction product of the alkylaluminum compound and the nitrogen-containing compound.

13. Process for producing polyethylene by polymerizing ethylene and optionally comonomers in the presence of the solid catalyst system according to any of claims 1 to 11.

14. Polyethylene obtained or obtainable by the process according to claim 13.

15. An article comprising the polyethylene according to claim 14, preferably selected from the group consisting of films, tubes, bottles, IBC containers, closed and open tubs, and fuel canisters.