The development and industrialization process in methyl mercaptan synthesis with hydrogen sulfide and methanol in domestic and international field were introduced.The reaction mechanism for the process was discussed,and the key points of reaction were to reduce the alkaline of hydroxy on methanol and enhance nucleophilic performance of hydrogen sulfide.The type of catalyst,catalytic mechanism and research progress on catalyst were mainly discussed,and the application of acid and alkali catalytic theory in the progress was emphasized in this paper.
This paper introduced general situation of nitrobenzene production at home and aboard,as well typical occupational accidents.It is studied how to ensure safe production with device practice.
Based on the ingredients of latex emulsion matrix and the related accidents at home and abroad in recent years,we will analyze and judge the risks exist in the preparation of the traditional emulsion matrix,put forward the corresponding opinions,analyze the advantages of site mixed emulsion matrix in preparation and application,and point out the necessity of the popularization of site mixed emulsion explosive technology.
The enterprise’s execution status of production and business operation plan was analyzed by flexible using statistical calculation method,statistical chart,statistical analysis method,the main cause effecting target plan complete was analyzed and searched.
This paper briefly describes the operational principles and main characters of regulating valve with intelligent valve locator in automatic control system.It also introduces some application problems related to this kind of valve in pipe rolling and metallurgy automatic control system of Hengyang Valin Steel Tube Co.,Ltd.(Hereinafter refer as Heng-steel in short),and some skills and methods of fault treatment as well.
A system construction for fine management is a management concept and culture,its principle is "fine,accuracy,meticulous,rigorous".As developing fine culture,applying advance quality management measures,establishing and improving a mechanism for fine personnel development,the management of every unit in organization could be accurate,efficient,concerted and sustained,so that the whole benefit of enterprise could be promoted by means of systematization,programmed,standardization,informatization.
As the by-product of coal processing,coal tar is an important chemical raw material,has extensive application value.As a purification of coal tar is the premise of its deep processing,the method of removing impurity by additive was studied for the effect to ash content of coal-tar,the results shown that ash content could reduce to 0.00449% by above treating method.The reaction's optimum condition was:the additive amount of dilute sulfuric acid(as V water :V sulfuric acid=20) was 6mL,reaction time 60 minutes;the additive amount of dilute aqueous ammonia(as V water :V ammonia=3) was 40mL,reaction time was 20 hours.
In order to improve the recovery rate of gold of refractory gold ore,putting forward the sulfate process titanium dioxide production process,use about 70% concentration of sulfuric acid leaching of roasted ore of iron,so iron into acid leaching solution,stripping of iron in the inclusion gold,so as to improve the yield of refractory gold ore,has certain development and the innovative significance for gold industry,with good economic and social benefits.
In present,most wet washing tower of Shell powdered coal gasifying process appeared exit over-temperature that influenced by operation temperature,the kind of coal and loading.As the exit over-temperature cause analyzed,it was found that the enter three-way pipe corrosion was accelerated in quench gas compressor by over-temperature.So,the operation temperature should be optimized,the suitable kind of coal be stable and be running in high load as possible,the potency and superiority of the device could be functioning adequately.
The article discusses a phosphogypsum stack causing pollution problems and possible ways of use.Production building materials alone is difficult to completely consume phosphogypsum.Focusing on development of ammonium sulfate production from phosphogypsum are effective ways to solve storage issues of phosphogypsum,the production status of ammonium sulfate and ammonium sulfate production from phosphogypsum process discussed,with the successful implementation of industrialization.It should have a positive impact to technical progress of phosphorus chemical industry,the adjustment of industrial structure and sustainable development in China.
The phosphogypsum ammonium sulfate is another new approach in comprehensive utility of phosphogypsum,that is byproducts from phosphorus industrial,which contains impurities such as phosphorus,fluorine and organics.The washed filtration process for phosphogypsum may control the free phosphate concentration in a certain range,as the supply of raw materials to produce ammonium sulfate device use phosphogypsum pile solving pollution problems,and to make recycling promote economic effect,to play a positive role to promote the progress and development of phosphorus chemical industry in China.
The digital control technique is a technique controlling mechanical motion and working process by digital signal.The application of digital control technique not only brings revolutionary change to conventional manufacturing industry but also makes manufacturing industry into a symbol of industrialization.The fault cause of digital control machine is diverse,as problem on mechanical,digital control system,sensor element,driving element,strong electric part,line connection etc.Facing the problem of fault and maintenance of digital control machine,firstly it should nip in the bud,but not to solve problem after it occurred.To shoot the arrow at the target,the daily maintenance work should be done,the structure and principle of machine should be understood.
For keeping safety and high-load operation of synthesis system in particular for synthesis convertor,to maximize the benefits,the production flow was improved,series optimal operations were performed.As raw materials were rationally utilized,a high-load operation of whole system was achieved under energy saving and consumption reducing status.
Any work-piece machining should have a multiple-step from initial processing to finally detection of qualified and put use,so many factors could affect the quality of a work-piece.Therefore,to avoid or reduce the factor affecting machining accuracy,the working process should be considered carefully before machining,so that to maximize the process control.This paper analyzed various main factors affecting machine-working accuracy by concentrating good experiences and mistakes of past,and some practical measures were suggested which could reduce machining error maximally.
As conductivity of liquor condensate was over-proof frequently,about 100 ton of liquor condensate had been discharged,so that energy consumption was increased,and environment affected.To reduce the conductivity of liquor condensate,the processing capacity of humidification-steam stripping system was enhanced by increased flue-gas temperature,optimized flow direction,increased quantity of steam in low-pressure system,so that the conductivity of liquor condensate was controlled at 10μs/cm recovery criteria.
This paper provides an overview of yellow phosphorus refining arsenic removal process flow,main equipment and in the engineering design problems encountered in design and technical measures.Proved by practice,the process of the device is simple,reasonable design,reliable operation.The arsenic removal effect is good,technical indexes of the product reach the expected requirements.
As depositional silicon-calcium phosphate ores were the research object,the pre-concentration was tested by the table and spiral chute,through system condition test,make sure the table suitable process conditions were the pulp concentration 20%,inclination angle of the table 40,the flushing water quantity 4.0L/min;the spiral chute suitable process conditions were the pulp concentration 20%,the flushing water quantity 3.0L/min.The results show that,the effect of the spiral chute was better,based on ores with P2O5 grade of 25.80%,SiO2 grade of 15.82%,a comprehensive phosphate concentrate with P2O5 grade of 28.24%,SiO2 grade of 12.75% and recovery rate of 85.19% were obtained.
To resolve the interference of alkali recovery system caused by silicon reacted with sodium hydroxide forming sodium silicate and into stewing black liquid in bamboo wood stewing process with sulfate,it could reduce or resolve the influence of interference to bamboo pulping by adding precipitated silica agent as sodium meta-aluminate,calcium oxide,aluminum sulfate in stewing with sulfate process,and adding silicon removal agent as aluminum salt.
It is an important measure for improvement of enterprise's own automation to retrofit general machine tool to numerical controlled one.To realize the reconstruction,this paper explained the research content,key technology and methods of numerical controlled reconstruction.
A plenty of sulfur-bearing waste water,as H2S,come from petroleum refining,petroleum chemical engineering,coal chemical engineering,pharmaceutics,fuel industry,which caused great pollution to the environment,so choosing efficient sulfur-bearing waste water treating technology suitable their own had become a problem to be solved quickly.This paper introduced some typical industrial sulfur-bearing waste water treating technology at home and abroad and their applications,then simply explained the merit and demerit and prospects for development of these sulfur-bearing waste water treating technology.
