High-activity dechlorinating agent for fixed bed and preparation method thereof

Abstract

The invention relates to a high-activity dechlorinating agent for a fixed bed and a preparation method thereof. The preparation method comprises the following steps of: swelling methyl cellulose with deionized hot water; adding calcium chloride after the methyl cellulose is completely dissolved; uniformly stirring to completely dissolve the calcium chloride; dissolving NaOH in deionized water; dropwise adding NaOH aqueous solution into homogeneous phase aqueous solution of the methyl cellulose and Ca<+2> ions with violent stirring; performing centrifugal separation to obtain filter cakes; adding clay into the filter cakes; kneading and then extruding into strips; drying; calcining; and cooling to obtain the high-activity dechlorinating agent for the fixed bed. In the method, Ca(OH)2 precipitates are produced by precipitation reaction of the Ca<2+> and OH<-1>; the produced Ca(OH)2 is nanosized through dispersion, complexing and template action of the methyl cellulose; the clay is directly added without washing or drying after the precipitates are subjected to centrifugal separation; and the mixture is kneaded and extruded into strips so as to prepare a product. The defect that the commercial Ca(OH)2 is individually used as an active ingredient is overcome, and the high-activity dechlorinating agent has a large specific surface area and high chlorine content and dechlorinating activity, and the preparation process is simple and is low in cost.

Description

technical field [0001] The invention relates to an oil refining and chemical purification technology, in particular to a high-activity dechlorination agent for a fixed bed and a preparation method thereof. Background technique [0002] Fixed bed dechlorination agent is widely used in chemical fertilizer industry and oil refining industry to remove hydrogen chloride in gaseous materials and liquid materials, protect catalysts and equipment in subsequent processes, prolong the operating cycle of the device, and improve the economic benefits of the device. [0003] The active component of dechlorination agent for fixed bed is mostly Ca(OH) 2 , while the commodity Ca(OH) 2 Prepared by CaO digestion, the specific surface and pore volume are very small, which cannot meet the requirements of heterogeneous reactions, and Ca(OH) alone is used 2 The prepared dechlorination agent has low activity, small chlorine capacity and low utilization rate of active components. In order to inc...

AI Technical Summary

Problems solved by technology

[0003] The active component of dechlorination agent for fixed bed is mostly Ca(OH) 2 , while the commodity Ca(OH) 2 Prepared by CaO digestion, the specific surface and pore volume are very small, which cannot meet the requirements of heterogeneous reactions, and Ca(OH) alone is used 2 The prepared dechlorination agent has low activity, small chlorine capacity and low utilization rate of active components