甲胺水溶液
性質(zhì)
在常溫下為無色有氨臭的氣體或液體。易溶于水、乙醇和乙醚。易燃燒，其蒸氣能與空氣形成爆炸性混合物，爆炸極限526～21% (4.95%～20.7526)。相對(duì)密度0.662。熔點(diǎn)- 93.5℃。沸點(diǎn)-6. 3～-6.7℃。分解溫度250℃。閃點(diǎn)(閉杯)0℃。自燃點(diǎn)430℃。蒸氣壓(25℃)202. 65Pa。臨界溫度156.9℃。臨 界壓 力 4. 073kPa。 折射率1. 351。 40%-甲胺水溶液沸點(diǎn)49.4℃。點(diǎn)-9.94℃。相對(duì)密度（d15.5）o．904。
制法
由甲醇和氨以1：(1.5～4)的配料比，在高溫(425℃)、高壓(2. 45MPa)下，用活性氧化鋁作催化劑進(jìn)行連續(xù)氣相催化反應(yīng)生成一、二、三甲胺的混合粗品，再經(jīng)一系列的蒸餾塔連續(xù)加壓精餾分離，冷凝脫氨，脫水，可得到一、二、三甲胺工業(yè)品，同時(shí)也可根據(jù)用戶需要配成40%的一、二、三甲胺水溶液。
據(jù)有關(guān)文獻(xiàn)報(bào)道，改變甲醇和氨的配比是得到所希望產(chǎn)品的有效方法，甲醇和氨的比例為1：1.5時(shí)是生成三甲胺的最佳條件，而甲醇和氨的比例為1:4時(shí)是生成一甲胺的最佳條件。
用途
本品主要用作農(nóng)藥（樂果、殺蟲脒等）、醫(yī)藥（咖啡因、麻黃素等）、染料（茜素中間體）、炸藥及燃料（水膠炸藥、一甲肼等）、表面括性劑、促進(jìn)劑、顯影劑和溶劑等的原料。
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浩瀚色譜研制HH-AM甲胺專用柱測(cè)定甲胺溶液中氨、二甲胺與三甲胺含量的GC法。對(duì)甲胺溶液中的雜質(zhì)氨、二甲胺和三甲胺進(jìn)行檢測(cè)，通過控制氣相色譜中的色譜柱類型和參數(shù)、質(zhì)譜中的檢測(cè)器類型和采集模式、供試品溶液的檢測(cè)濃度，能夠?qū)崿F(xiàn)對(duì)甲胺溶液中的氨、二甲胺和三甲胺的同時(shí)檢測(cè)，且具有較高的靈敏度、準(zhǔn)確性和較好的專屬性。
名稱：甲胺專用柱
規(guī)格：3m*3mm
*高溫度：120度
型號(hào)：HH-AM
應(yīng)用：甲胺溶液中氨，甲醇，一甲胺，二甲胺，三甲胺，水的測(cè)定
適用于：島津GC2010，GC-2014，GC-2030
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methylamine water solution?
nature
It is a colorless gas or liquid with ammonia odor at room temperature. Easy to dissolve in water, ethanol, and ether. Easy to burn, its vapor can form explosive mixtures with air, with an explosive limit of 526-21% (4.95% -20.7526). The relative density is 0.662. Melting point -93.5 ℃. Boiling point -6 3~-6.7 ℃. Decomposition temperature is 250 ℃. Flash point (closed cup) 0 ℃. The self ignition point is 430 ℃. Vapor pressure (25 ℃) 202 65Pa. The critical temperature is 156.9 ℃. Critical pressure 4 073kPa. The refractive index is 1.351. The boiling point of 40% - methylamine aqueous solution is 49.4 ℃. Point -9.94 ℃. Relative density (d15.5) 0.904.
Manufacturing method
Methanol and ammonia are mixed in a ratio of 1: (1.5-4) at high temperature (425 ℃) and high pressure (2 Under a pressure of 45MPa, a continuous gas-phase catalytic reaction is carried out using activated alumina as a catalyst to produce a mixed crude product of one, two, and trimethylamine. It is then subjected to a series of distillation towers for continuous pressurized distillation separation, condensation deamination, and dehydration to obtain industrial products of one, two, and trimethylamine. At the same time, it can also be prepared into a 40% aqueous solution of one, two, and trimethylamine according to user needs.
According to relevant literature reports, changing the ratio of methanol to ammonia is an effective method to obtain the desired product. The optimal condition for generating trimethylamine is when the ratio of methanol to ammonia is 1:1.5, while the optimal condition for generating methylamine is when the ratio of methanol to ammonia is 1:4.
purpose
This product is mainly used as a raw material for pesticides (such as dimethoate and chlorfenapyr), pharmaceuticals (such as caffeine and ephedrine), dyes (intermediate of Alizarin), explosives and fuels (such as water-based explosives and hydrazine), surface dispersants, accelerators, developers, and solvents.
The development of HH-AM methylamine specific column for the determination of ammonia, dimethylamine, and trimethylamine content in methylamine solution by GC method using Haohan chromatography. By detecting impurities such as ammonia, dimethylamine, and trimethylamine in methylamine solution, and controlling the column type and parameters in gas chromatography, detector type and collection mode in mass spectrometry, and detection concentration of the test solution, it is possible to simultaneously detect ammonia, dimethylamine, and trimethylamine in methylamine solution with high sensitivity, accuracy, and specificity.
Name: Methylamine specific column
Specification: 3m * 3mm
*High temperature: 120 degrees
Model: HH-AM
Application: Determination of ammonia, methanol, methylamine, dimethylamine, trimethylamine, and water in methylamine solution
Applicable to: Shimadzu GC2010, GC-2014, GC-2030
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