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Manganese deoxidier and its preparation method and application

A deoxidizer and manganese-based technology, applied in the direction of chemical change purification/separation, etc., can solve the problems of low deoxidation capacity and high regeneration temperature, achieve large deoxidation capacity, improve mechanical strength, and prolong the effect of regeneration cycle

Inactive Publication Date: 2009-07-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to overcome the defects of activation, regeneration, high use temperature and low deoxidation capacity of existing deoxidizers, the present invention provides a MnO / Mn 3 o 4 Olefin deoxidizer with alkaline earth metal oxide and alumina as active component as active component, preparation method and application thereof

Method used

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  • Manganese deoxidier and its preparation method and application
  • Manganese deoxidier and its preparation method and application
  • Manganese deoxidier and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0046] Weigh 420g triangular rhomboid MnCO 3 Fine powder, 60g pseudo-boehmite powder (bulk density 0.28g / ml, specific surface area 280m2 after roasting at 450°C 2 / g, weight loss 25%), 60g CaO fine powder, the three are fully mixed. Add an appropriate amount of distilled water and knead well. Then use extruder to prepare strips of Φ5; place overnight and dry in the air; dry at 120°C for 3 hours; cut into small sections with a length of 3 to 5 mm after cooling. The sample was evenly divided into 4 parts, which were respectively fired at 350, 400, 450, and 500° C. under an air atmosphere for 4 hours (Examples 1-4). Take a small amount of samples and use X-ray energy spectrometer to analyze the Mn of four deoxidizers 3 o 4 、Al 2 o 3 , CaO content. Take 50ml of deoxidizer respectively and put them into a Φ25 stainless steel reactor, and pass H at 280°C 2 Reduction 12h, H 2 Airspeed is 10h -1 . After cooling down, under the pressure of 0.4Mpa, respectively at the tempera...

Embodiment 5～8

[0050] According to the trigonometric rhombohedral MnCO 3 : Pseudoboehmite (bulk density 0.28g / ml, specific surface area 260m2 after calcination at 450°C 2 / g, weight loss 24%): CaO is respectively in weight ratio 7:2:0.5 (embodiment 5), 7:3:0.25 (embodiment 6), 7:1:2 (embodiment 7), 7:3 : 0.5 (embodiment 8) prepares four parts of samples, fully mixes, each adds appropriate amount of 1.0% dilute nitric acid and kneads, then prepares the strip shape of Φ5 with extruder; Place overnight, dry in the air; 120 ℃ of oven dry 3 hours ; After cooling, cut into small sections with a length of 3 to 5 mm. It was then fired at 450°C for 4 hours in an air atmosphere. The prepared deoxidizer was activated and evaluated under the same operating conditions as in Example 1, and the evaluation results are shown in Table 2.

[0051] Table 2 Chemical composition and deoxidizer performance of Examples 5-8

[0052]

Embodiment 9

[0054] 10 grams of MgO was used to replace 10 grams of CaO powder in Example 3, and the deoxidizer was prepared, activated and evaluated under the same conditions as in Example 3. The results are shown in Table 3.

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Abstract

The invention discloses a manganese-based deoxidizer and a preparation method and application thereof. The deoxidizer of the present invention takes MnO / Mn3O4 as the active component, and adds active accelerators alkaline earth metal oxide and alumina. The invention provides two preparation methods. The Mn3O4 precursor compound or its calcined active Mn3O4 is mixed with alkaline earth metal oxides or hydroxides and alumina, kneaded, shaped, air-dried, and finally dried or dried and then calcined. The deoxidizer of the present invention is obtained. The deoxidizer of the present invention can remove 1-2000 ppm of oxygen in ethylene and propylene, has high deoxidation depth, deoxidation capacity and activity, low activation, regeneration and use temperature, and high mechanical strength. When the deoxidizer of the present invention is used in industrial production, the regeneration period can be extended, the production cost can be reduced, and the economic benefit is obvious.

Description

technical field [0001] The present invention relates to a kind of manganese series deoxidizer and its preparation method and application, more specifically, the present invention relates to a kind of MnO / Mn 3 o 4 A high-capacity and high-activity deoxidizer as an active component, 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: BCG, BCH, DQ, PZ, metallocene catalysts, etc. have been used in industrial production. In order to avoid poisoning and deactivation of suc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/148
Inventor 吕顺丰秦燕璜黄凤兴吴秀香
Owner CHINA PETROLEUM & CHEM CORP
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