硫酸尾气制液体二氧化硫

硫酸生产排出的尾气含有0.3—0.5％的二氧化硫和少量的三氧化硫。如果不回收利用,不仅浪费资源,而且污染大气。株州化工厂将硫酸尾气进行了回收,制成液体二氧化硫。液体二氧化硫是生产锦纶和医药的重要原料,副产品硫铵母液是很好的肥料,同时还可生产亚硫酸铵代替烧碱作为造纸工业的原料,做到了化害为利,变废为宝。 液体二氧化硫的生产工艺,是采用氨水吸收硫酸尾气中二氧化硫、三氧化硫生成循环母液,然后用93％硫酸分解循环母液,产     

酸性尾气净化处理

我厂生产凡士林、白油采用老工艺(三氯化铝精制和酸精制)。间断生产过程排放出尾气中含有SO_2、SO_3、Hcl等酸性气体,其浓度瞬间超过国家标准,操作工人需戴防毒面具在恶劣环境中工作.必须采取措施积极予以治理. 一九八○年采用加高烟囱排放,由于SO_2未经净化,飘落扩散至厂区及居民区造成污染及危害.最后决定采用波纹填料喷淋塔,用     

三氯乙酰氯尾气净化处理再利用

三氯乙酰氯尾气含有多种有毒有害物质,如果尾气在排放前得不到有效处理,会对环境造成严重污染,同时造成物料浪费,生产环境呛人无法操作,严重制约企业正常生产,因此,生产尾气必须得到有效处理和利用,找到一种在环保性、可行性、经济性上都有优势的处理办法,彻底改善工作环境,使生产能够稳定连续生产。     

再生胶生产工艺尾气可望达标排放

由江西省国燕橡胶有限公司研制的再生胶生产工艺尾气净化技术和装置 ,日前通过了由中国石油和化学工业协会组织的新技术成果鉴定。再生胶是把废旧橡胶制品经分解、破碎、筛选、配料、脱硫后再生而成的。我国再生胶生产工艺经历了由油法到水法再到动态脱硫工艺生产再生胶的过程。动态脱硫新工艺提高了再生胶行业的生产装备水平 ,提高了劳动生产率和再生胶质量 ,改善了操作条件。但生产过程产生的尾气中仍含有有害气体 ,如硫化氢、苯、甲苯等 ,对环境造成较大污染。国燕橡胶有限公司采用余热回收、气液分离、尾气焚烧等方法及相关设备 ,对尾气…     

砷酸生产尾气治理

通过砷酸生产中含硫尾气治理实例，介绍治理系统的预处理、脱硫及废水封闭循环。     

尾气资源的回收利用——天津海豚炭黑有限公司发电锅炉尾气母管工程

一、前言天津海豚炭黑有限公司现有两台额定蒸发量为15t/h的发电锅炉,即3#发电锅炉和4#发电锅炉,所使用的燃料为炭黑生产炉产生的尾气。3#发电锅炉是以5#生产炉的尾气作为燃料,4#发电锅炉是以6#生产炉的尾气作为燃料(见图1)。随着5#、6#炭黑生产炉设备的日益老化,当其中一条生产线因     

尿素尾气系统的防爆措施

尿素尾气系统的防爆措施山西焦化工业总公司祁春生水溶液全循环法生产尿素的中氮肥企业，在二氧化碳原料气脱氢装置未能推广的情况下，在正常生产过程中，惰性气体器出口气和尾气吸收塔出口气中，氨、氧、氢、甲烷等主要组分能够形成爆炸性混合气体，这是水溶液全循环生产...     

沥青尾气焚烧炉在齐鲁点火成功

6月5日一座具有国内先进水平的沥青尾气焚烧炉在齐鲁石化公司胜利炼油厂点火投用.胜利炼油厂是我国最大的沥青生产基地,每年生产各种沥青近70万吨.原有旧沥青尾气焚烧炉工艺落后、焚烧率低.为了根治沥青尾气污染、保护环境,1994年胜利炼     

从普钙含氟尾气中回收氟化钠

普钙生产过程中,当磷矿粉和硫酸在混合反应时,伴有大量废水逸出,如四氟化硅、氟化氢、二氧化碳、二氧化硅等,其中氟化氢、四氰化硅都具有强烈刺激性臭味,对人体十分有害(刺激眼、鼻、破坏皮肤、骨骼)。生产一吨普钙排出的废气达300m~3左右,含氟量为20g/m~3废气。普钙工厂排出的含氟气体通常回     

上海染料化工厂治理硝酸尾气

上海染料化工厂采取各种切实有效的技术措施,治理硝酸尾气,减少了闵行地区的大气污染。该厂将在硝酸生产、氧化吸收过程中产生的 NO 气体,经两座氧化吸收填料塔,用碱液送流、吸收 NO_x 后     

再生胶工业废气的生物法净化研究

采用生物法废气净化技术净化治理橡胶再生低浓度有机废气 ,工业试验装置连续运行 10 0d的结果显示 ,其对再生胶废气中甲苯的净化效率可较长时间保持在 90 %左右 ,废气经处理后可以实现达标排放。废气处理成本约为工厂再生胶产值的 0 12 %～ 0 14% ,具有较好的技术先进性和经济合理性。后续的工程化装置连续运行并达标验收     

硫酸系统水平衡分析计算和生产实践

在硫酸系统中,通过水平衡分析计算烟气带入净化工序的SO2体积分数和含水量,确定净化工序的能力,控制干燥塔进口烟气温度,使干吸工序生产出合格产品;通过计算,烟气带入净化工序的水量小于产品带出的水量,制酸净化污水经过污水处理工序处理后返回到净化工序重复使用,实现净化污水零排放,消除对环境的污染.     

超快速液相色谱-串联质谱法测定制药废水中阿维菌素的研究

建立了采用固相萃取-超快速液相色谱-串联质谱（SPE-RRLC-MS/MS）测定制药废水中阿维菌素残留的方法.水样经离心、沉淀蛋白质后,上清液采用HLB固相萃取柱富集和净化;以0.1%甲酸水溶液和50%～90%甲醇为流动相,采用AgilentPlusC18柱进行RRLC分离,在串联质谱ESI（＋）模式下采用多反应监测模...     

生物法废气净化专用微生物菌种及其作用

用气相培育驯化法培养获得废气净化专用菌种,由其挂膜制作的生物膜填料塔对废气中甲苯进行净化,实验结果表明,气相培养法所得菌种对甲苯的净化性能明显优于液相培养法所得菌种.生物膜通过吸附-生物降解作用过程净化气相中的甲苯,使针对挥发性有机废气生物净化过程提出的吸附-生物膜动力学理论的依据得到了验证.     

Formic acid and acetic acid measurements during the Southern California Air Quality Study

As part of the Southern California Air Quality Study (SCAQS), ambient levels of gas phase formic acid and acetic acid have been measured at four locations: a ‘control’ site (San Nicholas Island), a source-dominated coastal site (Long Beach) and two inland smog receptor sites (Claremont and Palm Springs). Samples were collected on alkaline traps and were analyzed by size exclusion liquid chromatography with ultraviolet detection. Levels of gas phase formic acid (up to 19 ppb) and acetic acid (up to 17 ppb) exhibited diurnal (frequent night-time maxima), spatial and seasonal variations. During summer smog episodes, concentrations increased from 0.6 ppb at the ‘control’ site to up to 13–19 ppb at the inland smog receptor sites reflecting primary emissions and in situ formation during transport inland. The acetic acid/formic acid (A/F) ratio decreased from coastal to inland sites. At the coastal site levels of both acids and the A/F ratio were substantially higher during the fall than during the summer.     

Formic acid as an alternative reducing agent for the catalytic nitrate reduction in aqueous media

Formic acid was used for the nitrate reduction as a reductant in the presence of Pd:Cu/γ-alumina catalysts. The surface characteristics of the bimetallic catalyst synthesized by wet impregnation were investigated by SEM, TEM-EDS. The metals were not distributed homogeneously on the surface of catalyst, although the total contents of both metals in particles agreed well with the theoretical values. Formic acid decomposition on the catalyst surface, its influence on solution pH and nitrate removal efficacy was investigated. The best removal of nitrate (50 ppm) was obtained under the condition of 0.75 g/L catalyst with Pd:Cu ratio (4:1) and two fold excess of formic acid. Formic acid decay patterns resembled those of nitrate removal, showing a linear relationship between kf (formic acid decay) and k (nitrate removal). Negligible amount of ammonia was detected, and no nitrite was detected, possibly due to buffering effect of bicarbonate that is in situ produced by the decomposition of formic acid, and due to the sustained release of H2 gas.     

金属掺杂二氧化钛光催化还原硝酸氮

采用光沉积法制备了负载金属Fe或Cu的P25二氧化钛光催化剂,用TEM、ICP、XRD及UV-Vis等对其进行了表征,并测定其在20 W紫外灯照射下光催化还原硝酸氮、去除总氮的效果;考察了pH值、搅拌气体、金属的负载量、空穴清除剂甲酸的用量以及金属Ag-Cu复合沉积等条件的影响.反应2 h的结果表明,二氧化钛上载铜量增加,硝酸氮转化率随之增加,但最大总氮去除率和氮气选择性均出现在0.5%Cu负载量下;氮气搅拌和酸性条件下反应,形成氮气的选择性略低(62%),但最高的硝酸氮转化率和总氮去除率分别达到36.9%和23.2%;CO2作为搅拌气体.Cu的负载量为0.5%、甲酸用量为0.06 mol/L时.形成氮气选择性最好(88.4%).硝酸氮转化率和总氮去除率分别为29.5%和25.1%.同样条件下,采用二氧化钛上共沉积金属总质量分数为1%、Ag:Cu=1:1的催化剂,硝酸氮的转化率可达48.1%,总氮去除率为34.2%,氮气选择性为72.2%.     

Process conditions of preparing methanol from cornstalk gas

The low-heat-value cornstalk gas produced in the down-flow fixed bed gasifier was tentatively used for methanol synthesis. The cornstalk gas was purified and the technical procedures such as deoxygenation, desulfurization, catalytic cracking of tar, purification and hydrogenation were studied. The catalytic experiments of methanol synthesis with cornstalk syngas were carried out in a tubular-flow integral and isothermal reactor. The effect of reaction temperature, pressure, catalysttypes, catalyst particle size, syngas flow at entering end and composition of syngas was investigated. The optimum process conditions and yield of methanol from cornstalk syngas were obtained. The experimental results indicated that the proper catalyst of the synthetic reaction was C301 and the optimum catalyst size (φ) was 0.833 mm×0.351 mm. The optimum operating temperature and pressure were found to be 235℃ and 5 Mpa, respectively. The suitable syngas flow 0.9-1.10 mol/h at entering end was selected and the best composition of syngas were CO 10.49%, CO2 8.8%, N2 37.32%, CnHm 0.95% and H2 40.49%. The best methanol yield is 0.418 g/g cornstalk. The study provided the technical support for the industrial test of methanol production from biomass (cornstalk)gas.     

线路板生产丝印区有机废气的净化

针对电子线路板厂洁净房丝印区有机废气污染的问题,选择间歇式固定床活性炭吸附法净化有机废气的工艺流程,通过制冷能力和吸附量的估算,设计空塔气速为0 . 6m s,吸附剂为果壳活性炭,装填高度为1m ,分双层多个抽屉式填装,运行后,实际监测净化效果明显,苯、甲苯、二甲苯的净化效率分别为81 .5 9% ,83. 5 0 % ,85 . 4 3% ,换下的废活性炭经再生解吸后可循环使用。回收的有机溶剂掺在柴油中作为发电机的燃料。     

碱性树脂吸附碳酸氢盐水溶液中甲酸的研究

采用静态法测定了5种树脂对碳酸氢钾溶液中甲酸的交换吸附量，其中，D293强碱性阴离子交换树脂具有最高的交换吸附量，考察了温度对D293树脂交换吸附量的影响。在30℃条件下，利用静态法测定了甲酸在D293树脂上的吸附等温线，在低的甲酸浓度范围内，Langmuir方程比Freundlich方程能更好地描述树脂对甲酸的吸附；同时，测定了甲酸在D293树脂上的穿透曲线。