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順酐，也稱為馬來(lái)酸酐或失水蘋(píng)果酸酐，是一種具有強(qiáng)烈刺激氣味的白色晶體。它的化學(xué)式為C4H2O3。順酐可以溶于乙醇、乙醚和丙酮，但在石油醚和四氯化碳中難溶。它與熱水反應(yīng)形成馬來(lái)酸。此外，順酐還應(yīng)用于多個(gè)領(lǐng)域，包括但不限于不飽和聚酯樹(shù)脂、醇酸樹(shù)脂、農(nóng)藥、涂料、潤(rùn)滑劑添加劑、造紙化學(xué)品、紡織品整理劑、食品添加劑以及表面活性劑等。

Maleic anhydride, also known as maleic anhydride or dehydrated malic anhydride, is a white crystal with a strong pungent odor. Its chemical formula is C4H2O3. Maleic anhydride can be soluble in ethanol, ether, and acetone, but it is difficult to dissolve in petroleum ether and carbon tetrachloride. It reacts with hot water to form maleic acid. In addition, maleic anhydride is also applied in multiple fields, including but not limited to the production of unsaturated polyester resins, alkyd resins, pesticides, coatings, lubricant additives, papermaking chemicals, textile finishing agents, food additives, and surfactants.

順酐的結(jié)晶點(diǎn)是指順酐從液體狀態(tài)轉(zhuǎn)變?yōu)楣腆w狀態(tài)時(shí)的溫度,也是一種反映順酐純度的指標(biāo)。順酐結(jié)晶點(diǎn)的高低會(huì)直接影響到順酐的質(zhì)量和效率,因此進(jìn)行結(jié)晶點(diǎn)分析及控制是工業(yè)過(guò)程中的重要環(huán)節(jié)。

The crystallization point of maleic anhydride refers to the temperature at which it transitions from a liquid state to a solid state, and is also an indicator of the purity of maleic anhydride. The high or low crystallization point of maleic anhydride directly affects the quality and production efficiency of maleic anhydride. Therefore, analyzing and controlling the crystallization point is an important link in the industrial production process.

順酐結(jié)晶點(diǎn)的測(cè)試所需儀器如下：

The required instruments for testing the crystallization point of maleic anhydride are as follows:

1. 全自動(dòng)結(jié)晶點(diǎn)測(cè)定儀SH406。

1. Fully automatic crystallization point tester SH406.

2. 結(jié)晶點(diǎn)專用試管。

2. Crystal point dedicated test tube.

實(shí)驗(yàn)步驟如下：

The experimental steps are as follows:

①把樣品如試管后，點(diǎn)擊觸摸屏對(duì)樣品進(jìn)行升溫加熱。

① After turning the sample into a test tube, click on the touch screen to heat up the sample.

②液體試樣量到結(jié)晶點(diǎn)試管的刻度線處。

② Measure the liquid sample to the mark on the crystallization point test tube.

③把傳感器插入對(duì)應(yīng)的儀器插口處。

③ Insert the sensor into the corresponding instrument socket.

④把傳感器套裝插入試管內(nèi)，將試管放入儀器中。

④ Insert the sensor kit into the test tube and place the test tube into the instrument.

⑤點(diǎn)擊觸摸屏，進(jìn)入“參數(shù)設(shè)置”，設(shè)置：“預(yù)期結(jié)晶點(diǎn)”“試樣編號(hào)”，設(shè)置完成后返回主界面。

⑤ Click on the touch screen to enter "Parameter Settings", set "Expected Crystallization Point" and "Sample Number". After setting, return to the main interface.

⑥在“主界面”，點(diǎn)擊“開(kāi)始”進(jìn)行實(shí)驗(yàn)。

⑥ In the main interface, click "Start" to conduct the experiment.

⑦實(shí)驗(yàn)完成后，自動(dòng)出結(jié)果，自動(dòng)打印，數(shù)據(jù)可通過(guò)U盤(pán)導(dǎo)出。

⑦ After the experiment is completed, the results will be automatically generated, printed, and the data can be exported through a USB drive.