Purification method of 2-acrylamido-2-methylpropanesulfonic acid
A methylpropanesulfonic acid, acrylamide-based technology, applied in chemical instruments and methods, sulfonic acid preparation, organic chemistry, etc., can solve problems such as high energy consumption, aging, environmental footprint, etc.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[0159] When the preparation of the (co)polymer includes a drying step such as spray drying, spray granulation, drum drying, drying by electromagnetic radiation (microwave, high frequency) or drying in a fluidized bed, the (co)polymer may be liquid , gel or solid form.
[0160] The (co)polymer may have a molecular weight between 10,000 and 30 million Daltons. It can be a dispersant, flocculant or superabsorbent.
[0161] The (co)polymer preferably comprises at least 1 mol % of 2-acrylamido-2-methylpropanesulfonic acid obtained according to the process of the invention, more preferably at least 5 mol %, even more preferably at least 10 mol %, even more preferably At least 30 mol%, and even more preferably at least 50 mol%.
[0162] The present invention also relates to the use of polymers obtained from crystals of 2-acrylamido-2-methylpropanesulfonic acid and / or salts thereof obtained by the method of the present invention in oil and gas recovery, water treatment, sludge treat...
Embodiment 1
[0169] Example 1 - Batch vs continuous comparison
[0170] 1.1-Within the scope of the present invention, 2-acrylamido-2-methylpropanesulfonic acid solution is 600kg.h -1 The flow rate is continuously fed into a thin-film vertical evaporator with a contact surface area of 1 square meter. The dwell time was 34 seconds. The thin-film vertical evaporator is heated to 80°C with water, and the distillation pressure is 30mbar. The measured evaporation flow is 72kg / h / m 2 . The suspension of 2-acrylamido-2-methylpropanesulfonic acid obtained after distillation was then passed continuously through a horizontal perforated basket wringer rotating at 800 rpm before being analyzed. The obtained 2-acrylamido-2-methylpropanesulfonic acid crystals had a purity of 99.9667% and contained 44 ppm of IBDSA and 88 ppm of IBSA. The yield of 2-acrylamido-2-methylpropanesulfonic acid crystals is 100kg·h -1 .
[0171] The 2-acrylamido-2-methylpropanesulfonic acid filter cake obtained after pas...
Embodiment 2
[0184] Example 2 - Effect of pressure
[0185] Example 1.1 was repeated at different pressures without washing steps (Examples 2.1 to 2.3). The results are summarized in Table 2.
[0186] Table 2
[0187]
[0188]
[0189] Table 2: Results related to Examples 2.1 to 2.3.
[0190] It can be observed that pressure plays an important role in the method according to the invention. By increasing the distillation pressure, the yield is reduced and the amount of IBDSA and residual IBSA can be reduced. Above 300 mbar, the yields are generally no longer industrially attractive.
[0191] Those skilled in the art will be able to adjust the distillation pressure depending on whether they are interested in higher purity 2-acrylamido-2-methylpropanesulfonic acid crystals or a higher yield.
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More