产品简介

聚四氟乙烯布氏漏斗及其抽滤装置

聚四氟乙烯布氏漏斗及其抽滤装置，是实验室中使用的一种仪器，用来使用真空或负压力抽吸进行过滤。 砂芯布氏漏斗在各位实验室老师使用反馈中效果比较好，相比于四氟布氏漏斗，砂芯可以更好的固定滤膜，让实验样品只能从滤膜中过滤，避免塌陷，周边留出不能有效过滤等问题

布氏漏斗形状为扁圆筒状，圆筒底面上开了很多小孔。下连一个狭长的筒状出口。

使用的时候，一般先在圆筒底面垫上，将漏斗插进上方开口并将接口密封（例如用橡胶环）。布氏烧瓶（一般建议用聚四氟乙烯材质）的侧口连抽气系统。然后将欲分离的固体、液体混合物倒进上方，液体成分在负压力作用下被抽进烧瓶，固体留在上方。

常用于有机化学实验中提取结晶。这种情况过滤完成后，还可以在上方用少量纯溶剂来洗掉结晶表面的杂质。

常见问题

　　先用水把滤纸润湿，抽一下，使滤纸紧靠在漏斗底端，可以防止待过滤的东西漏掉。倒入滤液，开机器抽，可以稍微搅拌，只剩下滤出物质（可见高中化学《实验化学》）

直接用普通的漏斗，贴上滤纸后，接上抽气泵进行吸滤(替代聚四氟乙烯布氏漏斗)是不行的。因为漏斗四壁紧贴滤纸处，负压吸滤对其不起作用。只有漏斗下顶角处产生压强差。由于该口较大，且只有一个口，很容易破裂。（湿滤纸不牢）

产品特点

1、可代替市场上的陶瓷布氏漏斗，避免碎裂

2、耐腐蚀性强：可耐受强酸强碱、王水、魔酸、氢氟酸等有机试剂；

3、外观纯白色，耐高温：使用温度-200～250℃；

4、防污染：金属元素空白值低。铅、铀含量小于0.01ppb；

5、表面不沾，易于清洗；

6、使用真空或负压力抽吸进行过滤也可与吸滤瓶配套，用于无机制备中晶体或粗粒沉淀的减压过滤，可防止腐蚀性溶剂溅出；

7、备注：可以根据客户要求定制各种规格的布氏漏斗以及配套的抽滤装置。

Polytetrafluoroethylene Brinell funnel ａnd its pumping filter device

A teflon Brinell funnel ａnd its extraction filter device are laboratory instruments used for filtration using vacuum or negative pressure suction. The effect of sand-core Brinell funnel is better in the feedback of laboratory teachers. Compared with the Teflon Brinell funnel, the sand core can better fix the filter membrane, so that the experimental samples can only be filtered from the filter membrane to avoid collapse, ａnd the surrounding area can not be effectively filtered

The Brinell funnel is shaped like an oblate cylinder, ａnd many small holes are opened on the bottom of the cylinder. It is connected with a long, narrow, cylindrical outlet.

When used, the bottom of the cylinder is generally covered with filter paper, the funnel is inserted into the opening above the Brinell flask ａnd the interface is sealed (for example, with a rubber ring). Brinell flask (generally recommended to use PTFE material) side mouth with extraction system. The mixture of solid ａnd liquid to be separated is then poured into the , the liquid component is pumped into the flask under negative pressure, ａnd the solid remains above.

It is often used to extract crystals in organic chemistry experiments. In this case, after the filtration is completed, a small amount of pure solvent can also be used on the to wash away impurities on the crystalline surface.

The use of a Brinell funnel

First moisten the filter paper with water ａnd pump it so that the filter paper is close to the bottom of the funnel to prevent the things to be filtered from missing. Pour the filtrate, turn on the machine to pump, you can stir slightly, only the filtered material (see high school chemistry "Experimental Chemistry")

It is not possible to directly use an ordinary funnel, paste filter paper, ａnd connect an air pump for suction filtration (instead of a teflon Brinell funnel). Because the four walls of the funnel are close to the filter paper, the negative pressure suction filter does not work on it. Only the lower corner of the funnel produces the pressure difference. Because the mouth is large ａnd has only one mouth, it is easy to rupture. (Wet filter paper is not strong)

Polytetrafluoroethylene Brinell funnel features:

1. It can replace the ceramic Brinell funnel on the market to avoid fragmentation

2, strong corrosion resistance: can withstand strong acid ａnd alkali, aqua regia, magic acid, hydrofluoric acid ａnd other organic reagents;

3, the appearance of pure white, high temperature resistance: the use of temperature -200 ~ 250℃;

4, anti-pollution: metal element blank value is low. Lead ａnd uranium content is less than 0.01ppb;

5, the surface is non-stick, easy to clean;

6, the use of vacuum or negative pressure suction for filtration can also be matched with the suction filter bottle, used in inorganic preparation of crystals or coarse sediment vacuum filtration, can prevent corrosive solvent spatter;

7, Note: can be customized according to customer requirements of various specifications of Brinell funnel ａnd matching filter device.