Studied the liquid - phase synthesis of butyl acetate from n - butyl alcohol and acetic acid using the supported heteropoly blue as catalyst . examed several factors imposing on esterification . the results revealed : using this catalyst , the reactions conversion percentage reaches nearly 100 % , product yield is 98 . 9 % , selectivity is 98 . 9 % . reusing it 10 times , the efficiency is still well . in addition , using this catalyst , the reactions temperature is mild , the reaction time is short and the equipment hasnt any erosion . furthermore , there is no “ threewastesdischarge 对以负载型杂多蓝为催化剂的乙酸与正丁醇的液相酯化反应进行了研究.考察了影响酯化反应的因素.结果表明：以负载型杂多蓝为催化剂，酯化反应转化率接近100 % ，收率可达98 . 9 % ，选择性为98 . 9 % ，重复使用10次催化效果仍好.该催化剂还有反应条件温和、反应时间短、对设备无腐蚀、无三废排放等优点
This paper aimed to explore four relevant issues of the coal - thermal power - chemical industry base in east ningxia as follows : to build the advanced industry agglomerations with resource saving and environment protection based on coal gasification ; to build the electric power system with advanced technology , scale economy benefit and long - term competitiveness ; to build the circular economy and the conservation and reconstruction of eco - environment ; to master planning , urban and town system planning of the coal - thermal power - chemical industry base in east ningxia and strategic allocation of mining areas , industrial park , urban and town 摘要为了使宁东能源化工基地及城镇建设最大限度地减少以至消除三废污染，建成先进的科学的产业集群和循环经济，提出了建设中四个战略问题，即以煤炭气化为中心环节，建立资源节约型、环境友好型的先进产业集群；建设技术先进、具有规模经济效益和综合竞争力的电力系统；发展循环经济，保护和改善生态环境；编制好宁东基地建设总体规划和城镇体系规划，搞好矿区、工业园区和城镇的战略布局。
Problems existing in the development of water resources in yin - chuan basin are : surface water , groundwater , water for city use and water for agriculture use as well as water for ecological use are not reasonably programmed , leading to the waste of water resources and occurrence of salted soil . at the same time , because of the large amount drainage of wasted water , solids and gas as well as the comprehensive use of chemical fertilizer , the groundwater was polluted in different degree , the range and extent of the pollution have a tendency to increase yearly . whether the water is used in industry or in agriculture , the waste of water is very serious , the technology of water usage is slow , and the production value of water is low 银川盆地在水资源开发利用中所存在的主要问题是：对于地表水和地下水、城市用水和农业灌溉用水以及生态用水等缺乏合理规划，造成了水资源的浪费以及土壤盐渍化问题的发生；同时，由于工业“三废”的大量排放以及农药、化肥的广泛使用，使地下水不同程度地污染，而且污染程度和范围有逐年加大的趋势；无论是农业用水还是工业用水，浪费现象都十分严重，用水技术落后，单方水的工农业产值相对较低。
Item construction conditions : tungsten sandstone and its processing is our county ' s traditional industry . we take the advantage not only in market and resources but also in processing technology . the corporation is located at wuji township of hengdong county where there is abundant water , electric power and convenient transportation . the corporation yard area is broad and ease to deal with wastes . the item is a promising project 三、项目建设条件：钨砂及产品深加工是我县的传统产业，有市场、资源、加工技术优势，公司位于衡东县吴集镇，供水、供电良好，交通方便，厂区面积宽敞，三废处理简单，项目发展潜力大。
This article presents a discussion on the feasibility of using dye - gelatine type anti - halation layer technique in aerial photographic film . a series of delicate technical problems were solved smoothly , consequently creating a sound basis for running normal practical production 一、前言人类赖以生存的环境只有一个- -地球,而从目前的状况来看,地球的生态环境正在日趋恶化.其恶化的基本因素在于人为形成的"三废" ,即"废渣" 、 "废气"和"废液" .而五颜六色的废弃包装产品和包装材料又是产生废物的重要来源之一
Based on an analysis of groundwater pollution situation , the harmful result , causes and the pollution channels , the authors put forward a series of countermeasures , such as the tackling of " three wastes " , the restriction and suspension of exploitation , the layering exploitation and the drawing of water as well as the replenishing of the sources 摘要在对许昌市2000 ~ 2004年地下水水质污染状况、危害、原因和途径分析的基础上，及时采取治理“三废” 、限采停采、分层开采、引水补源等防治对策。
