Abstract
The effect of the components of the catalyst solution for the hydrocyanation of acetylene on the activity and selectivity of the process under liquid-phase conditions has been studied. The introduction of ZnSO 4 and ZnO additives into the shop catalyst did not give a positive effect under these conditions. Studies of catalysts in non-aqueous media lead to an increase in their activity and selectivity in comparison with aqueous media. It has been shown that the composition of the CuCl - NMP - DMF catalyst is characterized by high activity (up to 32 g / l.h.) and selectivity (83-90%), i.e. the activity of this composition is almost twice as high as compared to the water-based ones (12-18 g l.h.).
Highlights
In order to increase the productivity of the catalyst for the production of acrylic acid nitrile (NAC), together with the central laboratory association (CLO) "Navoiazot" (Republic of Uzbekistan), studies of the synthesis of NAC by hydrocyanation of acetylene were carried out in a laboratory unit in the presence of liquid-phase catalysts
P / o "Navoiazot" have developed [1,2] a new, more efficient catalyst composition for the synthesis of vinyl acetate based on acetylene
Analysis of the shop catalyst with additions of ZnSO 4 and ZnO was performed in comparison with the original shop catalyst. (Table 1) For this, preliminary synthesis of NAC in a laboratory unit was carried out on a shop catalyst, and the synthesis on the same shop catalyst with the addition of ZnSO 4 in an amount of 4.0%
Summary
The effect of the components of the catalyst solution for the hydrocyanation of acetylene on the activity and selectivity of the process under liquid-phase conditions has been studied. In the operating shop of the NJSC p \ o "Navoiazot", the liquid-phase (water) hydrocyanation of acetylene with the formation of acrylonitrile is carried out on a shop catalyst of the following composition \% mass \ CuCl-30; NH 4 CI15; H 2 O-52. This catalyst composition has a number of disadvantages: low productivity of 12-15 g per liter of catalyst per hour, low catalyst activity and insufficient rate of acetylene dissolution, as well as a short service life [3,4]. The consumption of hydrocyanic acid was calculated based on the amount of HCN consumed for a certain time
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