First, a chlorinator was self-designed in this paper, and dichloride of 2-methyl-1-propene was synthesized by 2-methyl-1-propene reacted with chlorine fast in this reactor. By means of the Orthogonal Experiments design and single factor experiments, the influence of several reaction variables on the yield were examined and the optimum reaction conditions under the intervallic operation were obtained, the yield and selectivity of dichloride of 2-methyl-1-prop-ene were more than 65% and 80% respectively. Second, the preparation of 2-methylene-1, 3-propanediol, which dichloride of 2-methyl-1-propene reacted with alkali was investigated. By means of the Orthogonal Experiments design and single factor experiments, the influence of several reaction variables on the yield were examined and the optimum reaction conditions under the intervallic operation were obtained, the conversion of dichloride of 2-methyl-1-propene was 100%. Moreover the preparation of MPO, which 2-methylene-1, 3-propanediol reacted with hydrogen, in presence of Al_2O_3-Pd catalyst, was gotten, and the product was appraised.

本文在氯化反應(yīng)過程中东北粗口国产床，自行設(shè)計(jì)制作出了氯化管式反應(yīng)器，在該反應(yīng)器中異丁烯和氯氣迅速混合反應(yīng)生成二氯異丁烯，根據(jù)該氯化反應(yīng)特征利用正交試驗(yàn)和單因素試驗(yàn)考察了有關(guān)因素的影響并優(yōu)化得到了最佳工藝條件老熟妇乱子A片免费，二氯異丁烯的總收率達(dá)65％以上，選擇性達(dá)80％青青女在线被干视频；接著www.jizzcom，對(duì)二氯異丁烯進(jìn)行水解反應(yīng)制得了2-甲烯-1，3-丙二醇色先锋先锋影音AV资源站，討論了相關(guān)因素對(duì)水解反應(yīng)的影響3级电影网站入口，并通過正交試驗(yàn)和單因素試驗(yàn)得到了較佳工藝條件，二氯異丁烯的轉(zhuǎn)化率達(dá)100％亚洲视频在线观看第五区；同時(shí)還對(duì)制備的2-甲烯-1看一下最好最好的黄片片最刺激的视频，3-丙二醇在常壓下采用三氧化二鋁負(fù)載鈀催化劑催化加氫得目的產(chǎn)物MPO，并對(duì)產(chǎn)品進(jìn)行了鑒定久久老司机亚洲精品福利网站，從而打通了整個(gè)工藝路線久久精品无码专区免费东京热。

This thesis first research the effect of the additive and material, which can restrain ice crystal adhere onto the heat exchange surface. Then oriented at practical industrial application, a new kind of shell and tube type dynamic ice generator is designed.

本文對(duì)在蓄冰溶液中加入添加劑和換熱表面改性這兩種抑制冰晶在換熱面上粘附的方法進(jìn)行了研究，同時(shí)綜述和比較了國內(nèi)外各種形式動(dòng)態(tài)制取冰漿的方法欧美一级aa高清大片在线同性，并結(jié)合工業(yè)的實(shí)際應(yīng)用中文自拍日韩在线播放视频免费，設(shè)計(jì)出了一種殼管式冰漿生成器，搭建了溶液動(dòng)態(tài)制冰實(shí)驗(yàn)臺(tái)国产欧美黄片在线看最新款，對(duì)冰晶在其管束換熱面上粘附的過程進(jìn)行了理論和實(shí)驗(yàn)研究日本三级网站网址大全:。

Re-W alloy is oxidized and separated through air lancing reaction in a tubular oxidizing furnace with different temperature zones, and the Re oxide is heated and reduced in H2 atmosphere to obtain high purity Re powder.

將鎢錸合金在具有不同溫區(qū)的氧化氣氛管式爐中進(jìn)行吹掃反應(yīng)，同時(shí)對(duì)不同區(qū)域溫度igao13.com、吹掃氣體流量国产主播在线播放、反應(yīng)系統(tǒng)出口氣流量進(jìn)行集中控制，以便在合適的氣氛與溫度下使鎢錸合金充分氧化欧美喷浆，并得到有效分離玖玖玖在线资源，最終對(duì)錸的氧化物在氫氣氛中加熱還原色色的五月天，制得高純錸粉。

Molded siphons have a one-piece trap and bell with no glue joints, and are dimensionally consistent.

模制的虹吸管有一個(gè)一體化的彎管和鐘罩日本黄色片A三级三级三级，沒有任何膠接處尤物视频网址免费看，整個(gè)產(chǎn)品在尺寸上是均勻一致的。

In this paper, the basic principle of the conventional slip energy recovery induction motor drive is discussed. Two kinds of slip energy recovery induction motor driving systems with high factors are discussed, and the performance analysis of these methods is compared. On the basis of above, a new type of three-phase and four-line slip energy recovering drive is proposed.

本文首先從普通串調(diào)原理入手国产区露脸在线视频，簡要分析了影響串調(diào)系統(tǒng)功率因數(shù)的主要因素韩国精品视频在线一区二区；在對(duì)三相四線雙晶閘管串級(jí)調(diào)速、新型GTO串級(jí)調(diào)速等幾種高功率方案進(jìn)行分析與比較的基礎(chǔ)上日韩清纯无码自拍视频网站，提出了一種新型三相四線制雙IGBT串級(jí)調(diào)速控制方案一级a片欧美在线视频。

Delikang oxygen dose applied to a variety of similar products, the product output of the oxygen in line with the "People's Republic of China Pharmacopoeia" on the standard Medical Oxygen purity 99.5%,, and through the State Drug Administration inspected the award of the ODCCP armed quasi-established, enterprise production licenses.

得力康制氧劑適用于各種同類產(chǎn)品，該產(chǎn)品產(chǎn)出的氧符合《中華人民共和國藥典》關(guān)于醫(yī)用氧的標(biāo)準(zhǔn)純度99.5%殴美特级黄片，91福利视频导航一区二区，并通過國家藥檢局檢驗(yàn)合格，頒發(fā)了藥管械準(zhǔn)字號(hào)欧美性爱精品影库，企業(yè)生產(chǎn)許可證男人禁黄色视频。

The reaction conditions of methanol dehydrogenation to water-free formaldehyde was studied in a 16mm diameter fixed bed ceramic tube reactor,using Na_2CO_3 as catalyst,which was prepared by different ways.

在一個(gè)內(nèi)徑為16mm的固定床陶瓷管反應(yīng)器中，研究了用不同方法制備的碳酸鈉催化劑催化甲醇脫氫制無水甲醛反應(yīng)的工藝條件中文字幕黄片。

Product sub-pipe, plate, easy to install, security, environmental protection, in the scope of use as applied to HVAC systems regardless of wind pipes, refrigeration and heating equipment, hot water piping and process piping cold insulation, vapor density to ensure the whole system sex.

產(chǎn)品分管材免费最婬荡的毛片18以下禁止、板材，易于安裝日日夜夜国产一区，安全環(huán)保欧美性爱一级免费看，在使用范圍內(nèi)適用于暖通系統(tǒng)中的不管和風(fēng)管，制冷和制熱設(shè)備又粗又长的黄色视频，熱水管道及工藝管路的保冷保溫亚洲A级片中文字幕在线观看，保證整個(gè)系統(tǒng)的汽密性。

After dryness, silica powder is put into chlorinated furnace in fluid bed and reacts with dried hydrogen chloride gas in the environment of 340℃ to form crude trichlorosilane. The crude trichlorosilane , through hydroscrubber and pipe bundle condenser to extract silicon tetrachloride in distillation column produces trichlorosilane gas out of the d istillation column , which can be made into the finished product of trichlorosilane by condensation .

硅粉經(jīng)干燥后加入氯化沸騰爐美国A级片一级片欧洲精品，與通入爐中的干燥氯化氫氣體在340o C進(jìn)行反應(yīng)国产精品香蕉在线的人，生成的粗三氯氫硅經(jīng)濕法除塵器、列管冷凝器去蒸餾塔分離匹氯化硅一区二区不卡免费在线，由蒸餾塔出來的三氯氫硅氣體經(jīng)冷凝2020av天堂在线，制得三氯氫硅成品。

In the domestic vitriol industry, tube-crust anode protection cooler of oil of vitriol is widely used.

在國內(nèi)硫酸生產(chǎn)行業(yè)中99r热久久，陽極保護(hù)管殼式濃硫酸冷卻器應(yīng)用廣泛一本大道香蕉欧美精品69，它是硫酸生產(chǎn)工藝中用在吸收塔循環(huán)酸系統(tǒng)對(duì)濃硫酸進(jìn)行換熱的設(shè)備，其能否正常運(yùn)行是冶煉煙氣制酸系統(tǒng)正常生產(chǎn)的基本前提之一欧美人与动牲性行为视频。