Mn-Ag double active components desoxidant, preparation method and application thereof

A deoxidizer and double-active technology, applied in the field of olefin processing, to achieve high mechanical crushing strength, increase deoxidation capacity, and prolong the effect of regeneration cycle period

Active Publication Date: 2008-04-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to overcome the existing MnO-Mn 3 o 4 The reduction and regeneration temperature of the deoxidizer is higher than 280°C, and it is necessary to add a binder to improve the mechanical crushing strength of the deoxidizer. The present inv

Method used

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  • Mn-Ag double active components desoxidant, preparation method and application thereof
  • Mn-Ag double active components desoxidant, preparation method and application thereof
  • Mn-Ag double active components desoxidant, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example

[0089] Comparative example 1~2:

[0090] Weigh 140g MnCO 3 Fine powder, 20g pseudo-boehmite powder, 20g CaO fine powder, mix the three thoroughly. Add appropriate amount of distilled water and knead well. Then use an extruder to prepare φ3.5mm strips; leave it for more than 24 hours and dry it; dry it at 120°C for 3 hours; and cut it into small sections of 3-5mm after cooling. It is fired at 450°C in an air atmosphere for 4 hours. Prepared into Mn 3 O 4 / Al 2 O 3 -CaO deoxidizer. The measured crush strength was 25 Newtons. Pass H at 160°C (Comparative Example 1) and 280°C (Comparative Example 2) 2 Reduce for 12 hours. After cooling, the deoxygenation capacity was measured under the above conditions, and the results are shown in Table 1.

[0091] Table 1 Deoxidizer performance of comparative examples 1~2

[0092]

[0093] Since the deoxidizers of Comparative Examples 1 and 2 do not contain silver additives, the deoxygenation capacity after reduction at 160℃ for 12 hours is only 1...

Example Embodiment

[0094] Example 1 Preparation of calcium aluminate and calcium aluminosilicate composite carrier

[0095] Weigh 5.50 kg of alumina bauxite with 74.2% by weight and 4.50 kg of calcium carbonate with 53.3% by weight of CaO, pulverize to below 70μm, mix well, and calcinate at 1350~1450℃ for 4 hours. , Cooling, crushing, 70μm sieving. Prepare the carrier used in the present invention. Its weight percentage component is: Al 2 O 3 53.9%, CaO 33.9%, SiO 2 5.84%, TiO 2 2.75%, Fe 2 O 3 2.0%, MgO 0.55%. Specific surface area 0.38 M 2 / g, the particle size is less than 70μm. XRD diffraction results show that the main component of the carrier is calcium aluminate CaAl 2 O 4 , CaAl 4 O 7 , And a small amount of calcium aluminosilicate Ca 2 Al 2 SiO 7 mixture.

Example Embodiment

[0096] Example 2 Preparation of calcium aluminate carrier

[0097] Weigh Al 2 O 3 6.90kg of industrial alumina with 98.5% by weight and 5.40kg of heavy calcium carbonate with 55.3% by weight of CaO, crushed to less than 70μm, and mixed well, calcined at 1550~1650℃ for 5h, discharging, cooling and crushing , 70μm sieving. The preparation cost is the calcium aluminate carrier used in the invention. Its weight percentage component is: Al 2 O 3 68.5%, CaO 30.2%, SiO 2 0.53%, Fe 2 O 3 0.5%. Specific surface area 0.48 M 2 / g, the particle size is less than 70μm. XRD diffraction results show that the main component of the carrier is calcium aluminate CaAl 2 O 4 And CaAl 4 O 7 .

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Abstract

The present invention relates to olefin processing technology, and is especially double active component Mn-Ag deoxidizer for deoxidizing olefin and its preparation process and application. The Mn-Ag deoxidizer has Mn3O4 as main active component and small amount of Ag2O catalyst capable of lowering the temperature and decreasing the time for reducing Mn3O4 into MnO possessing deoxidizing activity. The Mn-Ag deoxidizer has calcium aluminate carrier and no other adhesive, high active component content and high deoxidizing capacity, and possesses very high compression strength. The Mn-Ag deoxidizer may be regenerated through reduction at 80-160 deg.c, and can reduce oxygen content in ethylene, propylene, etc at room temperature to below 0.05 ppm. The Mn-Ag deoxidizer is applied in industrial polyolefin production, and has long regeneration period, capacity of preventing poisoning of polymerizing catalyst and low production cost.

Description

technical field [0001] The invention relates to the field of olefin processing, in particular to a Mn-Ag double active component deoxidizer for olefin deoxidation, a preparation method and application thereof. Background technique [0002] Ethylene and propylene are important basic organic chemical raw materials, which generally contain trace oxygen. According to the national standard GB7715-87 for ethylene raw materials and GB7716-87 for propylene raw materials, the oxygen content in qualified polymer grade ethylene and propylene is ≤5ppm (5×10 -6 V / V, the same below). With the rapid development of polyethylene and polypropylene technology, various new high-efficiency polyethylene and polypropylene catalysts, such as: UCAT-J, BCS01, BCG-1, SCG-1, BLC-S, SLC-G, TH-1L , metallocene catalysts, etc. have been applied in industrial production. In order to avoid poisoning and deactivation of such high-efficiency polyolefin catalysts, the trace oxygen content in ethylene and pr...

Claims

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Application Information

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IPC IPC(8): C07C11/02C07C7/148C01G45/02C01G5/00
Inventor 吕顺丰秦燕璜黄凤兴吴秀香
Owner CHINA PETROLEUM & CHEM CORP
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