RU2077947C1 - Method of catalyst production - Google Patents

Abstract

FIELD: gasses purification from harmful impurities, method is used for ozone disintegration in production with its participation, that is water preparation, sewage purification, semiconductors treatment in micro electronics, disinfection in medicine and agriculture, etc. SUBSTANCE: method of catalyst production provides for mixing of manganese dioxide and copper oxide with binder (taluma), taluma treatment by water under temperature of 70-100 C for 0.5-5.0 h and calcinating under temperature of 200-400 C for 1-6 h, shaping of granules by worm feeder granulator, hydrothermal treatment, drying and calcinating. Method allows to increase significantly productivity of catalyst production technological process. EFFECT: increased productivity.

Description

 The invention relates to the purification of gases from harmful impurities and can be used, in particular, for the decomposition of ozone in industries with its participation, namely, water treatment, wastewater treatment, semiconductor processing in the microelectronic industry, disinfection in medicine and agriculture, etc.

A known method of producing a catalyst for the decomposition of harmful impurities, including mixing manganese dioxide, copper oxide and a binder (bentonite clay) in a ratio of 100: (15 30): 14, the formation of granules, their drying at 60 90 ^o C for 9 to 15 hours and heat treatment at 260 350 ^o C for 20 40 min (USSR Patent N 1806008, CL B 01 J 37/04, 23/84 26.11.91).

 The disadvantage of this method is the instability of the granules of the obtained catalyst in relation to water.

The closest to the proposed technical essence and the number of matching features is a method in which the catalyst is obtained by mixing manganese dioxide, copper oxide and a binder (thalium) in the ratio (30 40) :( 20 30) :( 30 50), molding granules by pressing mixtures of components in a matrix followed by extrusion of granules, their hydrothermal treatment at 90 100 ^o C for 4 h, drying at 200 ^o C for 2 h and calcination at 300 ^o C for 3 h (ed. St. USSR N 1768274 cells B 01 J 23/84, B 01 D 53/36, 12.29.90).

 The disadvantage of this method is the low productivity of the technological process for producing a catalyst due to the inability to form granules on a screw granulator, due to the non-ductility of the paste mixture of the components.

 The aim of the invention is to increase the productivity of the technological process for producing a catalyst by making it possible to form granules consisting of manganese dioxide, copper oxide and a binder (thalyum) in the ratio (30 40) :( 20 30) :( 30 50) on a screw granulator.

 The goal is achieved by the proposed method, including mixing manganese dioxide and copper oxide with a binder (thalium), forming granules; hydrothermal treatment, drying and calcination.

The difference between the proposed method and the known one is that the formation of granules is carried out on a screw granulator, and the thalum is treated with water at 70-100 ^° C for 0.5 5.0 hours before mixing the components, and then calcined at 200-1000 ^° C for 1 6 hours

 The method is as follows.

Take 0.6 1.0 kg of thallium, treat it with water at 70 100 ^o C for 0.5 to 5.0 hours, and then calcine at 200 1000 ^o C for 1 to 6 hours. Thus treated talyum is loaded into a paddle mixer with a steam jacket into which 0.6 0.8 kg of manganese dioxide and 0.4 0.6 kg of copper oxide are preloaded (in terms of dry matter). The mixing process is carried out at 40 70 ^o C for 0.3 to 1.0 h. The resulting paste is unloaded and formed on a screw granulator at 100 120 ^o C and a pressure of 35 45 atm through filters with a hole diameter of 1.0 to 3.5 mm The formed granules are kept in air at room temperature for 8 36 hours, subjected to hydrothermal treatment at 80 100 ^o C for 2 5 hours, dried at 80 200 ^o C for 3 10 hours and calcined at 300 400 ^o C. Productivity of the proposed method for molded granules is 85 114 kg / h. The performance of molded granules by a known method (ed. St. USSR N 1768274, 12.29.90) is 8 10 kg / h.

Example 1. Take 0.8 kg of thallium and treat it with water at 90 ^o C for 4 hours, and then calcined at 350 ^o C for 4 hours. Thus treated thalium is loaded into a paddle mixer with a steam jacket, which is preloaded 1.4 kg of manganese dioxide paste with a humidity of 50% and 0.9 kg of copper oxide paste with a humidity of 55%. The mixing process is carried out at 50 ^o C for 0.7 hours. The resulting paste is unloaded and formed on a screw granulator through filters with a hole diameter 1, 2 mm. The formed granules are kept in air at room temperature for 24 hours, subjected to hydrothermal treatment at 90 ^° C. for 4 hours, dried at 120 ^° C. for 6 hours and calcined at 350 ^° C. The productivity of the formed granules was 114 kg / h .

Example 2. The process as in example 1, with the exception of the temperature and processing time of the thalium with water, which amounted to 70 ^o C and 0.5 h, respectively. The performance of molded granules was 85 kg / h.

Example 3. The process as in example 1, with the exception of the temperature and time of treatment of thalium with water, which amounted to 100 ^o C and 5 hours, respectively. The performance of molded granules was 108 kg / h.

Example 4. The process as in example 1, except for the temperature and time of calcination of thalium after treatment with water, which amounted to 200 ^o C and 1, respectively. The performance of molded granules was 92 kg / h.

Example 5. The process as in example 1, with the exception of the temperature and time of calcination of thalium after treatment with water, which amounted to 1000 ^o C and 6 hours, respectively. The performance of molded granules was 105 kg / h.

The highest productivity on molded granules is observed when molding granules on a screw granulator and pretreating thalium with water before mixing the components at 70,100 ^o C for 0.5 5.0 hours and then calcining it at 200 1000 ^o C for 1 6 hours. when process parameters go beyond the specified values, the productivity of molded granules decreases markedly.

 The essence of the proposed method is as follows.

The increase in productivity when molding granules on a screw granulator and pretreating thalyum with water before mixing the components at 70-100 ^° C for 0.5 5.0 hours and then calcining it at 200-100 ^° C is apparently caused by the formation of a highly plastic paste of the catalyst components after mixing, which is easily formed on a screw granulator. The initial thalium mixture of calcium aluminates has a low specific surface area and is a relatively coarse particle. When mixed with fine particles of manganese dioxide and copper oxide relative to coarse particles of thalium, a mixture of components is formed, which has a very low plasticity, which makes it impossible to form it on a screw granulator. The low ductility of such a mixture is due to the fact that the interaction energy of the binder particles with each other differs significantly from the interaction energy of relatively coarse particles of the binder with particles of finely divided manganese dioxide and copper oxide. On the other hand, the treatment of thalium with water at 70-100 ^° C for 0.5 to 5.0 hours and its subsequent calcination at 200-1000 ^° C for 1-6 hours leads to the formation of finely dispersed binder particles having a highly developed specific surface. In this case, the interaction energy of the binder particles with each other and the interaction energy of the binder particles with each other and the interaction energy of the binder particles between the particles of manganese dioxide and copper oxide are close to each other, and this leads to the formation of a highly plastic paste of catalyst components, which is easily formed on a screw granulator.

 Thus, the proposed method can significantly improve the performance of the technological process for producing a catalyst.

 This catalyst will allow for efficient cleaning of gas and liquid media from harmful impurities, in particular from ozone, and will provide a real opportunity to solve a wide range of large-scale environmental and technological problems.

 From the foregoing, it follows that each of the features of the claimed combination to a greater or lesser extent affects the achievement of the goal, namely, increasing the productivity of the technological process of producing the catalyst, and the entire population is sufficient to characterize the claimed technical solution.

Claims (1)

A method of producing a catalyst, comprising mixing manganese dioxide, copper oxide and thallium, forming granules, hydrothermal treatment, drying and calcining, characterized in that before mixing the thallium is treated with water at 70-100 ^° C for 0.5 to 5.0 hours and calcined at 200 1000 ^o C for 1 6 hours, and molding is carried out on a screw granulator.