久久99精品国产99久久6尤,国产成人精品综合网站,18国产精品白浆在线观看免费,久久成人无码视频,日本欧美不卡一区二区三区在线,欧美又黄又粗又爽免费看,欧美视频一区二区,免费人妻精品一区二区三区四区,狠狠色狠狠色综合网,97色伦图片7778久久

  • <strike id="i6ace"><input id="i6ace"></input></strike><fieldset id="i6ace"></fieldset>
  • <ul id="i6ace"><dfn id="i6ace"></dfn></ul>
  • <del id="i6ace"><dfn id="i6ace"></dfn></del>

     

    Dimethyl sulfate

    Update time:2021/11/03 09:57:11  ???View:  
    Dimethyl sulfate, an organic compound, a colorless or slightly yellow, oily flammable liquid with a slight onion odor. It is easily hydrolyzed into sulfuric acid and methanol at 50°C or alkaline water. Decomposes slowly in cold water. It is combustible when exposed to heat, open flame or oxidant. Dimethyl sulfate is a reagent that can methylate DNA. After methylation, DNA can be degraded at the methylated position.
    Main purpose
    Used in the manufacture of dyes and as a methylating agent for amines and alcohols. Analysis reagents. Organic synthesis, methylating reagents. Solvent. Its vapor is highly toxic and has been used as a war gas. Used as a reagent for the determination of coal tar, and as a methyl substitution agent in organic synthesis.  
    PropertiesPhysical Chemistry
    Colorless or slightly yellow, oily flammable liquid with a slight onion odor. The molecular weight is 126.14. The relative density is 1.3322 (20℃/4℃). Melting point-31.8 ℃. Boiling point: 188℃/ring opening. The flash point is 83.33°C. The self-ignition point is 187.78℃. The vapor density is 4.35. The vapor pressure is 2.00kPa (15mmHg 76°C). Soluble in ethanol and ether, solubility in water is 2.8g/100ml. It is easily hydrolyzed into sulfuric acid and methanol at 50°C or alkaline water. Decomposes slowly in cold water. It is combustible when exposed to heat, open flame or oxidant.
    Combustion products: carbon monoxide, carbon dioxide, sulfur dioxide.
    Waste disposal
    Use incineration. The waste materials are diluted and neutralized and then incinerated, and the sulfur oxides discharged from the incinerator are removed by the scrubber.
    Laboratory destruction
    In the laboratory, it can be diluted and then destroyed by ammonia water. The reaction produces less toxic methylamine, dimethylamine and other substances.
    Fire fighting method
    Firefighters must wear gas masks and full-body firefighting suits. Extinguishing agent: water mist, carbon dioxide, foam, sand.
    Invasion method
    It is mainly inhaled through the respiratory tract, but can also be inhaled through the skin.
    First aid treatment
    First, quickly rescue the poisoned patient to a place with fresh air, remove contaminated clothes, thoroughly clean the skin, observe the irritation response for at least 24 to 48 hours, inhale oxygen in time, and give symptomatic treatment such as sedation, expectorant and antispasmodic drugs. When the site is contaminated, rinse thoroughly with normal saline or water as soon as possible, then rinse with 5-10% sodium bicarbonate solution, and then use cortisone and antibiotic eye drops alternately. Early, moderate, and short-term glucocorticoid therapy can be used. Effectively prevent pulmonary edema. Anti-infection and exposure or desensitization therapy is used for skin burns. We must always be alert to the occurrence of delayed poisoning effects.
    Patients with poisoning should absolutely stay in bed, keep quiet, and observe the condition closely. Emergency treatment includes reasonable oxygen inhalation, bronchial relievers and antitussives and expectorants. The application of adrenal glucocorticoids should be early, appropriate, and short-term; antibiotics should be given early, and sedatives can be given if necessary.
    Dimethyl sulfate is used as a methylating reagent in organic chemistry. However, with the in-depth research on carbonates, the application range of dimethyl sulfate is getting smaller and smaller, and it is believed that it will be completely replaced by non-toxic carbonates in the near future.
    Leakage emergency response
    Quickly evacuate personnel from the contaminated area to a safe area, and immediately isolate them for 150 meters, strictly restricting access. Cut off the fire source. It is recommended that emergency response personnel wear self-contained positive pressure respirators and anti-virus suits. Do not directly touch the leakage. Cut off the source of leakage as much as possible to prevent entry into restricted spaces such as sewers and flood drains. Small leakage: absorb with sand, vermiculite or other inert materials. A large number of leaks: construct dikes or dig pits for storage; cover with foam to reduce steam disasters. Use a pump to transfer to a tanker or a special collector for recycling or transport to a waste disposal site for disposal.
    Dangerous characteristics
    There is a danger of burning and explosion in contact with heat sources, open flames and oxidants. It may decompose violently in case of high heat, causing the container to rupture or explode. Reacts strongly with ammonium hydroxide.

    ------分隔線----------------------------

    Service Hotline:

    You only need a phone call, we will serve you attentively

    Consult now
    Copyright © Shandong Zhengji Chemical Co., Ltd.  All Rights Reserved   Case Number :魯ICP備20007847號-4 chemBlink Premium Supplier
    欧美变态另类刺激| 99re在线这里只有精品| 亚洲综合色一区二区三区日韩精品| 亚洲精品v欧美精品v日韩精品| www.久久精品| 久久乐国产综合亚洲精品| 亚洲国产精品一区二区三区在线观看| 综合色网站| 日韩色视频在线观看| 国产揄拍国内精品对白| 国产日本三级| 国产男女猛烈无遮挡免费网站| 日韩欧美不卡一卡二卡3卡四卡2021免费| 欧美尺寸又黑又粗又长| 91国偷自产中文字幕婷婷| 亚洲中文字幕无码AV正片| 日韩一区二区在线观看视频| 一区二区三区内射美女毛片| 国模无码视频一区二区三区| 美女高潮无遮挡免费视频| 精品国产AV色欲果冻传媒| 青草草在线视频免费观看| 国产成人综合色就色综合| 中国丰满少妇人妻xxx性董鑫洁| 在线观看伦理片| 国产成人精品无码一区二区| 婷婷五月综合缴情在线视频| 性欧美熟妇videofreesex| 国产色综合天天综合网| 亚洲一本到无码av中文字幕| 亚洲av无码专区亚洲av| 91足交视频| 亚洲激情无码视频| 亚洲欧洲自拍拍偷午夜色无码 | 插鸡网站在线播放免费观看| 亚洲综合久久综合| 亚洲欧美另类成人综合图片 | 亚洲一区精品无码| 国产三级精品三级在线观看| 国产二级一片内射视频播放| 草草久久久无码国产专区|