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2-Phosphonobutane-1,2,4-tricarboxylic acid CAS 37971-36-1 PBTCA

PBTCA has a low phosphorus content. Due to its structural characteristics of phosphonic acid and carboxylic acid, it has good scale and corrosion inhibition properties, which are better than commonly used organic phosphonic acids. Especially at high temperatures, its scale inhibition performance is far better than commonly used organic phosphonic acids. It can increase the solubility of zinc, has good resistance to chlorine oxidation, and has good complex synergy.

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Model:
37971-36-1
Brand:
futurechemical
Code:
37971-36-1

Product Description

2-Phosphonobutane -1,2,4-Tricarboxylic Acid (PBTCA)

CAS: 37971-36-1

Alias:1,2,4-tricarboxylic acid-2-phosphonobutane; PBTC; 2-phosphono-1,2,4-butanetricarboxylic acid; phosphonobutanetricarboxylic acid;

Molecular formula:C7H11O9P

Relative molecular mass:270.13

Structural formula:

2-膦酸丁烷-1，2，4-三羧酸（PBTCA）结构式

1. Performance and use:

PBTCA has low phosphorus content. Due to its structural characteristics of phosphonic acid and carboxylic acid, it has good scale and corrosion inhibition performance, which is better than commonly used organic phosphonic acid. Especially at high temperature, its scale inhibition performance is far better than commonly used organic phosphonic acid. It can improve the solubility of zinc, has good resistance to chlorine oxidation, and has good compound synergy.

PBTCA has a wide range of applications in the compounding of high-efficiency scale and corrosion inhibitors, has superior performance, and is also an excellent stabilizer for zinc salts. It is widely used in the corrosion and scale inhibition of circulating cooling water systems and oilfield water injection systems. It is particularly suitable for compounding with zinc salts and copolymers. It can be used in high temperature, high hardness, high alkali and occasions that require high concentration multiples. PBTCA can be used as a chelating agent and metal cleaning agent in the washing industry.

2. Technical indicators

Items

Index

Appearance

Clear, colorless to pale yellow aqueous solution

Active acid %

50.0 min

Phosphorous acid(as PO33-)%

0.5 max

Phosphoric acid(as PO43-)%

0.2 max

Density (20℃) g/cm3

1.27 min

pH(1% water solution)

1.5~2.0

Fe, mg/L

10.0 max

Chloride mg/L

10.0 max

Items	Index
Appearance	Clear, colorless to pale yellow aqueous solution
Active acid %	50.0 min
Phosphorous acid(as PO33-)%	0.5 max
Phosphoric acid(as PO43-)%	0.2 max
Density (20℃) g/cm3	1.27 min
pH(1% water solution)	1.5~2.0
Fe, mg/L	10.0 max
Chloride mg/L	10.0 max

3. Usage

PBTCA is usually used in combination with other water treatment agents such as zinc salts, copolymers, organic phosphorus, azoles, etc. If used alone, the dosage is 5~15mg/L.

4. Packaging and storage

PBTCA is packed in plastic barrels, 25kg or 250kg per barrel. Store in a cool place indoors. Storage period is 12 months.

5. Safety protection

PBTCA is acidic. Pay attention to labor protection when operating it. Avoid contact with skin, eyes, etc. Rinse with plenty of water after contact.

Related keywords：

Water treatment chemicals

Water treatment manufacturer

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Organic phosphorus

Organic phosphate

Organic phosphonic acid

Scale inhibitor dispersant

Scale inhibitor

Organic phosphorus scale inhibitor

2-Phosphonobutane-1 2 4-tricarboxylic acid 37971-36-1 PBTCA Organic phosphorus Organic phosphate Organic phosphonic acid Scale inhibitor dispersant Scale inhibitor Organic phosphorus scale inhibitor Water treatment manufacturer

Quality Assurance

Full-Process Quality Control: From incoming raw material inspection to in-process monitoring and final outgoing checks, every batch is inspected at each production stage against strict acceptance standards.
Third-Party Certified & Tested: Our quality management system is certified to ISO 9001, and products are regularly tested by accredited laboratories (e.g. SGS, TÜV). Test reports are available on request.
100% Batch Traceability: Each batch carries a unique lot number that links raw material records, production parameters, and test results, enabling complete traceability from factory to final delivery.
Pre-Shipment Inspection: Every order passes a final pre-shipment inspection, with inspection photos and reports shared before dispatch.

FAQ From Customers

Q1: What is the minimum order quantity?

A: There is no quantity limit for the first sample or trial order. Just tell us the actual quantity you need.
Q2: How can I confirm that the quality meets the requirements?

A: Provide your specifications, and our technical team will check them or customize them for you; we can provide TDS, MSDS, and COA, and accept third-party testing.
Q3: How do you ensure stable quality?

A: We manufacture under an ISO 9001 quality system, test every batch before release, and retain samples for 24 months for traceability.
Q4: Do you provide samples?

A: Yes — Free samples are available; freight is at buyer's expense for express delivery.